Questions tagged [email]

The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.

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15 views

Can OpenSMTPD relay mail from a whitelisted IP?

I am running opensmtpd and all is well. Of course I do not run an open relay and I tightly control how mail is sent through the mailserver. However, my personal mailtool runs on a different virtual ...
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How to debug non-delivery of SES email to one domain

I have an email delivery issue. I run a small web-based business for teachers. Recently, we switched to Amazon SES (through the SMTP interface, from a dedicated IP) for our email verification and ...
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IMAP server responds with “BAD…” error to “LIST…” after similar “LIST” command completes successfully

I'm getting a BAD... error when running a LIST command against an IMAP server that I'm not understanding and could use some help with. I run almost an identical command just prior to it to list the ...
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how to configure notifications on NAS My Cloud Expert Series EX4100 [closed]

I am trying to configure the notification task on the network in order to receive an email in case of an alert on My Cloud Expert Series EX4100. I tried to set up an email @gmail and try to send a ...
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1answer
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PTR recored Issue

We have 2 Mail servers ( Internal and External) the External is hosted by ISPA with ip address of 62.xxx.xxx.xxx, we use to have the internet from the same ISPA, and the PTR record is already setup. ...
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How to unblacklist an email at Microsoft/OutLook/hotmail

When trying to send email to clients who use Hotmail/Outlook/etc type email addresses, I get the following error: SMTP error from remote mail server after RCPT TO:some@email.com: 550 5.4.1 Recipient ...
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32 views

TLS connection check while sending the email [closed]

Please tell me how can I check whether outgoing email are TLS-enabled or not from the linux mail server.
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1answer
83 views

Getting the same email at the same time from root@server.myserver.com. Not sure where it came from

I created an AIDE script that able to monitor file changes in my hosting, and when something file has changed, it will send an alert email about the changes. In my opinion, I don't think the script ...
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MDA with support for RFC 2047 [closed]

After many years of good services, I plan to switch from Procmail to something more modern to filter my emails with regexps. An important criterion for the replacement software is that it should be ...
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26 views

postfix/master[1908]: warning: /usr/libexec/postfix/smtpd: bad command startup — throttling

I'm getting this error message for quite sometime and unable to find I exactly missed in the postfix mail configuration. Please see my master.cf and main.cf below. MASTER.CF Postfix master process ...
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Exim4, it's a good idea to automatically populate local_sender_blacklist based on hard bounces?

GMX in it's sender best practice says: The sender must immediately remove email addresses from their dispatch lists if hard bounces occur I'm using exim4, and with eximstats you can obtain a list of ...
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iRedmail cannot send Email to outside networks “Connection timed out”

After a successful installation of the mail server with iRedmail installer, I cannot send Emails to the outside networks. I can successfully receive mails, but I cannot create a new mail (to the ...
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1answer
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Sending through Postfix fails from a new server. Any troubleshooting suggestions?

Background My organization sends list emails from the Mailpoet plugin in Wordpress, hosted on a Linode VPS. We have a second VPS with Postfix installed, which is used as the SMTP server for Mailpoet's ...
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How do you diagnose the steps of opendkim

So I've been spending a few hours today upgrading the server I work on to sign emails with DKIM using opendkim and postfix. It actually works! The problem though is when I use a tool, such as the ...
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SQL Reporting Services email subscription configuration

I'm trying to configure a Microsoft SSRS 2014 server to send out emails. As far as I can tell all the settings are correct in RS Configuration Manager, and I can send an email from the server itself ...
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3answers
72 views

Does MX record conflict with A record?

I am pretty new to networking. I would like to buy a domain to setup a website and to use it also for emails. To do this, I should need to configure an A DNS record and a MX one. My question is... If ...
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How to create a local email relay for encrypt mails

We have a Ubuntu 20.04 server with redmine installed. Redmine send automated mails through an external smtp provider. We have also other services that do the same thing (teamcity etc) Everything works ...
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1answer
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Postfix: reject_unknown_client_hostname doesn't effect in main.cf, nor in master.cf

I'm trying to set smtpd_client_restrictions = reject_unknown_client_hostname to prevent a lot of spam connections, like postfix/smtpd[28054]: connect from unknown[185.143.72.16]. I set this value in ...
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Using Spring Boot web application to send email notifications via Ionos webmail SMTP not working

I have created a marketplace application which sends emails to users for various reasons, for example login or order confirmation. Everything works great when I send emails from Gmail but I can't get ...
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1answer
54 views

Microsoft wants us to “Confirm that your DNS is set up correctly”

Our emails are blocked by Hotmail and Outlook and Microsoft refuses to tell why ("I do apologize, but I am unable to provide any details about this situation since we do not have the liberty to ...
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1answer
62 views

How do I send e-mail out through a specific IP?

We have 3 IPs hooked to a single interface. I'd like e-mail traffic to go out through a specific IP, which is not the default one. (This is because we keep getting blocked by Spamhaus so I want to ...
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How do I ensure that only my e-mail server is sending e-mail through my network?

This is a follow-up to Our IP was listed by Spamhaus - how can we prevent this from happening again? - unfortunately, it is happening yet again. I was thinking that people could have malware on their ...
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1answer
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Why would a company start their e-mail subject line with a space?

I've just scratched my head, then screamed to the screen about a bug for a few hours. It turned out that a company was sending e-mails to me with subject lines such as: Your order 213434563 is ready! ...
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Exim4 not signing my Email, even after setting up the split config

I already try anything that I could. I use exim on ubuntu/debian based, and using split config, and this's the config DKIM_CANON = relaxed DKIM_SELECTOR = mail # Get the domain from the outgoing mail....
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1answer
23 views

No route to host and Connection timed out

I try to install Postfix to use it with PHP. I did the installation with this tutorial: how-to-get-php-mail-working-on-ubuntu-16-04 I sent an email but nothing happens. When I look to mail.log, I get ...
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1answer
73 views

Any benefit to adding SPF record for mail relay that doesn't align with RFC5322.From domain?

When using a mail delivery service, like AWS SES or SendGrid, is there any benefit to including their SPF records for the domain in the RFC5322.From (header-from) header? With how they operate by ...
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1answer
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How to connect to mail.hotmail.com via port 25 from DNS as instructed by Outlook

If you read https://sendersupport.olc.protection.outlook.com/pm/troubleshooting.aspx, it says Confirm that your DNS is set up correctly Try connecting to mail.hotmail.com via port 25. If you are ...
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Yahoo Mail server constantly deferring mail from my server “due to user complaints”

I have a 100% no-spam score on mail tester. Have no problem with Gmail server, all users getting my emails. Have everything like SPF and other spam related criteria enabled. Yet, Yahoo mail server ...
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Postfix not printing all the status=sent logs in /var/log/maillog?

We have configured a postfix mail server, it takes email IDs from a CSV file, which has 13,500 recipients. The email is sent to all the recipients at a time, but in /var/log/maillog we only get around ...
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66 views

Load balacing email servers: MX vs A/AAAA vs Anycast IP

I'm curious about what are the differences and considerations when implementing email server load balacing between these three methods: Multiple MX records with the same priority/preference number ...
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4answers
125 views

SSL certificate expired error when connecting to corporate email

Since root SSL certificate expired on May, 30, I am unable to fetch any email from my corporate Microsoft Exchange server using evolution email client, and the error message says just that ssl ...
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2answers
67 views

Office 365 email with shared domain

I am migrating all my company mailoboxes, that actually are located on an internal IMAP server, to a Office 365 tenant. Since the migrating process whould take a quite long time, I need to share the ...
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2answers
25 views

Can I mark an email message with no-reply tag

My bos insists that I configure our mail so that when a message is received sender will get a auto-reply message confirming that his message was indeed received by our company. So is it possible to ...
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1answer
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How to install ProtonMail on Ubuntu Server 20.04?

I have a PRO account at ProtonMail and I want to use it for my web server. I found a tutorial here : https://pychao.com/2018/10/13/use-protonmail-bridge-on-headless-linux-machines/#comment-6612 ...
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1answer
65 views

Can I DKIM sign my email without running a server daemon just for that?

I have an email server that is working perfectly. However, more and more other email servers are getting strict about DKIM signing and DMARC records so I guess I need to finally set that up ... I am ...
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0answers
38 views

Postfix not send emails to remote MX Record (same domain in localhost)

I have a domain with mydomain.com configured in a postfix server, these domain have configured MX records to Google Suite In the postfix server i have the user: user1@mydomain.com In Google Suite ...
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Email phishing campaign

I was wondering if someone could help me with some context and how to approach a recent phishing attempt that our company had. We're a small company and had an external email use one of the VPs as ...
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1answer
209 views

SPF DNS void lookup limit exceeded [duplicate]

while testing my DKIM/SPF config by using the port25.com email service, I am getting the following reply for my SPF record: permerror (DNS void lookup limit exceeded) However, my spf record does not ...
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1answer
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I am getting following error while configuring office365 mail on contact us form in laravel 7. please anyone can

Swift_TransportException (554) Expected response code 250 but got code "554", with message "554 5.2.0 STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process ...
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1answer
19 views

Postfix/Dovecot/Amavis allowing only mail to be received (and not sent)

What is the best way to completely block outgoing mail on a linux server whilst still allowing incoming mail. It seems this can't be done with port blocking and I have tried smtpd_relay_restrictions =...
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1answer
33 views

How to resolve “signing key too small” issue from mail-tester

We've recently been having some email delivery issues, so I find myself taking my first dive into the email server set-up world to make sure our emails are arriving as expected. I ran mail-tester a ...
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4answers
271 views

Using SPF and DMARC records to combat invalid email subdomains

I have been able to confirm that bad actors are sending emails from nonexistent subdomains of my company's primary domain. Let's say my primary domain is foo.com. Email is sent from that base ...
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0answers
18 views

Postfix “not owned by user”

I have a VPS where I installed a Dovecot, Postfix, PostfixAdmin and Roundcube webmail. I haven't touch it from months but from 2/3 weeks I can't send e-mails anymore. I can only send them through ...
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1answer
44 views

Reject email and force the sender to switch MX records

I am setting up a mail server solution. I want to apply the scenario like this: The domain used is configured with 2 MX records (one with priority 1 - my server and one with 10 - a third party STMP ...
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Connect Cyrus Imap to AD

I am trying to connect Cyrus IMAP to an Active Directory following this instruction. I have set ldap_servers to ldap://myad.domain.com but if I telnet on the Cyrus Server it returns cyrus.domain.com. ...
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50 views

How to simulate a remote server that has a different public IP address?

I'm trying to set up 2 remote servers, each connected to the internet through their dedicated ISP router. In order to self-host email+web services and many more. My goal is to make them able to DNS ...
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47 views

Change From (Sender) address using Postfix as a relay and pass validation

I'm trying to relay mail via Postfix and change the sender address whilst also passing DKIM/DMARC validation. So if I send an email from user1@domainA.com via the Postfix relay (using it as a smart ...
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1answer
144 views

RoundCube: Connection to storage server failed

This is probably the hardest challenge I have ever faced on Linux. I would never thought sending and receiving the ubiquitous Emails is such hell of a complication! Following this tutorial on Setup ...
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1answer
25 views

Disable local delivery sendmail

I'm trying to disable local mail delivery on my sendmail server (CentOs 8). I've read many posts about this (for example: Disable local delivery in Sendmail) but non of the awnsers seem to work. I ...
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0answers
22 views

HAProxy mail forward rules

I use HAProxy as mail frontend (IMAPS) in SSL termination mode (mail clients configured to imap server 192.168.88.2 (haproxy host)). Config: frontend ft_imaps mode tcp bind 192.168.88.2:993 ...

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