Questions tagged [email]
The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.
6,676
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How to add a confirmed O365 domain as an Exchange Online accepted domain?
A little background on our AAD/O35 tenancy:
We have domainA as our primary domain. This is used for SSO, our primary email addresses, etc etc.
We acquired another business.
One of their domains (...
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Configuring Google Workspace (Gmail) to trust a Mail Relay via ARC?
I am building a system which modifies incoming emails body on the fly (for example, it deletes attachements with viruses). Of course, I break the DKIM signature when there is one. Is it possible to ...
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How to disable an Exchange 2016 mailbox and forward anything sent to it
fyi i would consider myself an exchange-noobie
Ok, the scenario is:
User left the company, but still gets a lot of mails sent to their mailbox. The AD User-password has been changed so they no longer ...
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187
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What are my server-side options for scanning email attachments for words and phrases?
I currently run an email system with Postfix/Dovecot and I am looking for a way to scan the contents of attachments (mainly doc(x) and pdf) for certain words and bounce the email back to the user with ...
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78
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DKIM and how it relates to DMARC reports
I've been tasked with setting up DKIM, SPF and DMARC for a business. I come from more of a development background, so as a result, I've been a bit confused on how to interpret the DMARC reports I'm ...
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712
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opendkim-testkey: key not secure (file permissions are good and TrustAnchorFile config setting is set)
If I run sudo opendkim-testkey -d mydomain.com -s selector -vvv, I get
opendkim-testkey: using default configfile /etc/opendkim.conf
opendkim-testkey: checking key 'selector._domainkey.mydomain.com'
...
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1
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400
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Emails delivered, but no where to be found
I have been working on this for 2 days now and am desperate for some help.
Postfix & Dovecot
CentOS Linux release 7.9.2009
Plesk 18.0.50
For the most part emails are flowing into the server ...
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199
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Postfix - How to send bounces only to postmaster?
I have an internal Postfix server where bounces are intentionally discarded (not recommended in general but needed for my use case).
I would like to enable it temporarily but only to the postmaster, ...
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227
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Emails sent with Perl NET::SMTP through Exim and then Postfix slow down when coming from one particular server
We have several servers set up on Debian 11 (Bullseye). One of the processes we run on all servers at regular interval during the day, with cron, is a perl script that reads from a MySQL database and ...
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573
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Changing hostname for the purpose of email delivery
I have email delivery issues, and MXtoolbox says "Reverse DNS is not a Valid Hostname". I have A and AAAA records for domain.com and mail.domain.com. The data center has set up reverse DNS ...
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170
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Getting IP suitable for email server
I am trying to use a VPS to host an email server using postfix. OpenDKIM and certbot was used to get DomainKeys and TLS. The data center setup reverse DNS. In case it matters, the IP is 188.68.231.119....
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138
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MX Record, POP3 Server, Port 110
I have setup my DNS for my domain name and have a POP3 server on my VPS.
Now, I want to a run a POP3 mail server without SMTP just to receive emails It will run on port 110, the POP3 port of my VPS.
...
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What exactly is Return-Path and who sets it?
This article (https://www.sparkpost.com/resources/email-explained/return-path-explained/) explains "Return-Path" as follows:
When an email doesn’t make it to its intended destination, the ...
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9k
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Can't setup Exchange account in Outlook
I'm trying to add a new account to Outlook but the wizard gives me an error:
Log onto Exchange ActiveSync Mail server (EAS): The server cannot be found. The username or password you entered isn't ...
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Configurating DKIM and SPF, key not secured
On a Ubuntu 20.04 VPS, installing opendkim via
sudo apt install opendkim opendkim-tools proceeds as expected, following the steps provided here.
However, upon testing, while e-mails get sent in ...
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117
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Custom error in Postfixadmin
can you please help me to add a custom error to Postfixadmin. In the config.local.php file I add the following to $CONF['password_validation'] = array()
'/([-#*.!@$%^&(){}:;<>,.?~_+=|].*){1}/...
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Long established Postfix / Dovecot environ had to be rebuilt, became an open relay; How do I know fore sure it's fixed, and, if not, fix it fast?
Because it's bad form here to ask multiple questions in ONE entry, I'll be asking about specific Postfix and Dovecot entries, however this nightmare has been going on since about January 19 and it's ...
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Is an email server that accepts an email and then silently filters it out complying with SMTP standards?
Can you send an email to an address, have it be accepted by the mail server, and then the mail server silently deletes it?
I am running an email server. I have noticed that some emails come from IP ...
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2
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726
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How to disable the default RBLs used by rspamd?
I'd like to use an RBL in rspamd without using all the preconfigured RBLs, but it seems that the configuration in /etc/rspamd/local.d/rbl.conf can only add new lists, not remove the default ones.
The ...
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1k
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Nginx mail proxy: tls between the proxy and the server?
When using the Nginx Mail Proxy feature to realize an SMTP proxy, there are several options available to configure (start)tls between the client and the proxy.
However, it appears between the proxy ...
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368
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Troubleshooting slurm e-mail settings
I am trying to setup a slurm installation and I have advanced towards the e-mail stage. So far I do not receive any mails. I have a working setup using msmtp-mta and msmtp. When I batch a script the ...
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122
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Mailgun Suppression List functionality
Running a mailman list on Redhat using Postfix. Trying to understand a couple of closely related concepts about Mailgun's Suppression List or Bounce List.
Is it "permanent", in the sense ...
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214
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mx record with IPv6 AAAA host
I need to setup a mail server or mx record with a IPv6 address
I have written a AAAA record which is working fine (pings, ports) here
I have setup hmailserver and checked all ports(587, 143) with ...
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280
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How to export on a text file the content of all mails in queue?
I'm noticing an anomalous activity for postfix and I want to check the outgoing mails
mailq shows a bunch of mails in queue with their id without any info on their specific body content to give me a ...
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597
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Dynamically move mails into matching mailboxes with sieve fileinto regex
I'm trying to create a sieve script, which files mails into mailboxes (or sub-directories of the inbox) matching a certain subject identifier.
For example if the subject includes 123 (three digits, 0-...
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1k
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DKIM and sending email on behalf of many domains - explain it to me like I'm a dummy
We run a server that provides a service for a few hundred customers, and there's a feature that allows them to generate some automated emails which go out to various colleagues and external partners. ...
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1
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1k
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Email proxy architecture
I'm trying to figure out how email proxies generally work. I want to present the way I see the architecture, would be glad if anyone could explain which of my assumptions is flawed and what am I ...
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Postfix - Auth restriction with multiple servers
I'm running two mailservers for one domain. One of them is a Microsoft Exchange server that holds a few mail accounts - and a Postfix one hosted on my Linux server to which mails are relayed from ...
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112
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Postfix bounce email when a recipient is not correctly written
I have an issue with a postfix install, version 3.5.17, in a email server with Debian 11, where when given an email with a list a recipients and if a recipient is not well written, like using ...
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2
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362
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Root domain in SPF record instead of full hostname
Can i use root domain like google.com instead of _spf.google.com in SPF record?.
My SPF record
v=spf1 include:_spf.mx.cloudflare.net include:_spf.google.com include:mxsmtp.sendpulse.com +a +mx ~all
...
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4k
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Gmail blocks mails in case they are forwarded
My website sends mails to users. This has been working wonderfully for years. But since a year or so, gmail blocks mails in the following scenario: A user has the email [email protected]. ...
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605
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How do i receive DMARC reports with external domains that i have no permission to control
I want to receive reports with gmail or outlook or anything else that i have no permission to add (mydomain.com)._report._dmarc.(gmail|outlook).com as a record. What i can do?
Example just like:
v=...
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168
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SPF Limits and SPF Merging
I am using Zoho Mail, AWS SES, GMAIL SMTP, Cloudflare email route and Yahoo SMTP. they all have there own SPF record. i saw on Google the only 1 SPF should be added in hostname and maximum 10 SPF ...
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380
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Multiple problems when trying to set up a no-reply email adress
I have an email server setup using Postfix, Dovecot and MySQL with virtual mailboxes using PostfixAdmin. This was created following a tutorial, because I am fairly new to email servers, and everything ...
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702
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DKIM E-Mail verification - prevent receivers from accepting unsigned emails?
I have set up SPF, DKIM and DMARC in my domain (to the best that I can figure out), but I still can send spoofed emails - without a DKIM signature - and they are accepted (at least when I test with ...
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Postfix not reachable temporarily
My Postfix system is reachable and everything is working (I set it up yesterday). But during multiple occasions today, it just wasn't reachable and I really don't know what to do. Usually it when not ...
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2
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2k
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Generate DKIM for Gmail Free Account
I am using Gmail SMTP with wordpress to send mail with my custom domain ([email protected]). Emails are successfully sent but always land in spam folder in every webmail provider (Eg, Gmail, Rediffmail,...
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1
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147
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Postfix: outgoing email error
Email send but not reached the receiver's mailbox, mainly for Google, Microsoft, and yahoo.
Already checked blocklisted or not, but no blocked there.
mail queue is mentioned below.
C6A02490A1 11809 ...
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457
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Email failure delivery
I already know the answer to my question, but I need to point to a reputable source to back up my claim, so I'm asking you to please describe what you think about the situation in simple terms.
My ...
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2
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483
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Multiple mail server from different provider for one domain is possible?
I have searched in google before asking here. I got a mixed answer in google.
Can i have a multiple MX record from different mail providers?
Example,
Zoho Mail
[email protected]
[email protected]
...
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57
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Can changing the DNS name of a postfix server damage reputation?
I was tasked with taking charge of all services at my current job after the person previously in charge left. Some of our services were using a domain name that's wholly in his possesion, not that of ...
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Setup mail server in Docker with FreeIPA and Roundcube
I try to setup my own mail server with authentication against a Ldap(FreeIPA). All of them must running within a docker container. I don't know what I'm doing wrong. Maybe it's my ldap configuration.
...
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894
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Send email via exim4 using port 587
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I have configured exim4 and am trying to send out emails using port 587 and the email is being sent but on the mail server it show connecting at port 25. I am using:
echo "Subject:Hello All&...
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481
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One domain with several mx records, allowing some users to use Google Workspace and others to use roundcube from the server
All setup and MX records have been configured for the domain example.com, which I added to my Google Workspace account. I also own the website example2.com. These two domains belong to two separate ...
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472
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How to reject spam emails with from field as my own email address?
I run my own postfix/dovecot email servers. Recently a lot of spam emails with identical from and to fields, which is my email address, flooded into my inbox. I added check_policy_service unix:private/...
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2
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Mail Validation: SPF qualifier ?all
How do mail servers (i.e. MS Exchange) handle the ?all option at the end of an SPF record?
I know from RFC 7208 that ? results in a neutral response. It means the SPF explicitly doesn't state whether ...
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197
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Send email to different port / redirecting port
I have an email server (Dovecot) and I want to emails be sent from other servers to a different IMAP port, because I can't use the ports 465 and 993
If someone could help me doing this, I would ...
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126
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Additional mail check by a custom script on Exchange Server
Customer would like to check e-mail content (including attachment parsing) from a list of accounts and, in case of some detected trigger words, to send a copy of the mail to a person who has to be ...
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2
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Postfix with ISPConfig and `Sender address rejected: User unknown in virtual mailbox table;` [closed]
I have a mail server that was configured with ISPConfig (amavisd, spamassasing, dovecote, etc) and a few non-standard tweaks from the tool's default tutorial (ISPConfig).
The server itself works ...
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365
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exim4: how to add an address as BCC to all the outgoing emails?
I'm working on an Ubuntu 20.04 web server where exim4 is used to send emails from the PHP application running on it.
Due to diagnostic and archival needs, I need to configure exim4 to automatically ...