Questions tagged [email-server]
Refers to the hardware or software that make up a server dedicated to sending and receiving emails. Many popular modern email servers bundle other functionality for contacts and calendaring along email delivery.
3,091
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backup from web host, how to import email from folder in the backup
Thank you for the interest in this topic, please help!
I made a backup from my hosting account at hostgator.com, but one of my friends that hosted their domain with me had IMAP setup in his outlook ...
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Add custom header to email
I have a question here that I'm a bit lost on, I need to create an email server with postfix, sendmail or something like that, but with something very specific, the idea is that an application in Ruby ...
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Exim rate limits and Amazon SES
Amazon SES sets certain limits for using its mail service. For example, sending a maximum of 14 emails per second or up to 50 recipients per email sent (to, cc or bcc).
What configuration can be ...
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Cannot get Exim to verify DANE for remote smtp
I am trying to configure Exim to try DANE before deciding to deliver unencrypted mail to remote hosts.
My general Exim configuration has: dns_dnssec_ok = 1.
For the dnslookup router: ...
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Setting up mailserver with Postfix/Dovecot
I'm probably missing something glaringly obvious here, but it's driving me nuts.
This week my mail server broke down, so I'm rebuilding one. I set this up YEARS ago, so I'm basically re-learning from ...
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How to install sendmail client only, without the MTA?
Is there any way to install the sendmail client, only, without installing the sendmail MTA at all?
What I mean by this is the sendmail -t command that is frequently used by processes such as cron to ...
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2
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O365/Exchange: Send From: external domain using connector and transport rule?
I have a successful and working 365 install (it's just family, but we're an Enterprise tenant because we have multiple domains.) Everything is working fine and I've recently been reviewing and ...
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Can I have more than one public keys saved in one selector for dkim?
The question is easy to understand, but it might be confusing. I understand that I can host multiple selectors for a DKIM record, but just out of curiosity, can I have multiple keys per selector in a ...
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unable to send emails to gmail using sendmail 550-5.7.26 error
The domain isn't registered with the same host though, so I'm using custom nameservers. and when I send emails like this :
sendmail [email protected]
this is a test.
.
I get this error :
(reason: 550-...
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2
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I can't seem to point the correct nameserver to my VPS
I'm hosting my domain on Namecheap and im trying to point my nameservers to connect to my VPS using Webuzo (on Hostinger)
it shows this error on my VPS on Webuzo:
" This system does not control ...
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Email Sender Identities / Single Sender Verification
I have a self-hosted web service and one of its features is allowing customers to send emails to their customers. Currently we send these emails on behalf of our customers by setting:
from: mailer@...
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IRedMail server rejecting mails
Hi I have installed my web mail. and I found it's listed on spamhaus. so I am tring to receive verify email them, this email is rejected.
Logs:
Feb 9 17:44:01 mail postfix/postscreen[2033648]: ...
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253
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opendkim not singing my outgoing emails ubuntu 20.04
i'm following this tutorial to integrate opendkim and sign my emails,i'm not much in ubuntu but i configured everything as the tutorial but the emails is sent without dkim signing
I'm hitting the wall ...
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Weird email spam issue. Google Domain Exchange email server
We have a client who is blocking our email domain.
Their IT wrote this to us. I've never seen this be an issue before.
You are hosted on Google but have entries referring to Microsoft email protection ...
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Postfix+Dovecot: emoji in subject from command line break the delivery ("SMTPUTF8 is required, but was not offered"), works from Gmail
Tl;dr: if I send an email to my Postfix+Dovecot server with the subject containing UTF-8 characters
email from Gmail => Postfix+Dovecot deliver the email correctly
email from mail (command line) =&...
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Why pickup service needs wake up from Postfix master?
The Postfix master.cf file contains a definition to wake up qmgr service:
# ==========================================================================
# service type private unpriv chroot wakeup ...
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DKIM signing - does it matter which transport agent does the signature
I am quite new to the dkim area. I understand how it works but some details, i am missing.
Let's say, i have a mail server that contains user boxes (Exchange) and an edge server that just transports ...
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Why is PTR needed in DNS, instead of using a service record or an MX record?
Why would an organization with an email system have a requirement that a system sending email to it needs a PTR reverse lookup DNS record of the IP address of the sending email server?
Can the ...
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Why Google SMTP MTA's are not sending STARTTLS command
I'm a software engineer that wrote my own SMTP delivery agent. I recently added the STARTTLS support to my software and I was doing some testing, when I noticed that Google's SMTP transfer agents are ...
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Subaddress (emails with plus) not working when email goes via Microsoft Exchange Frontend Transport
I'm trying to send an email to recipient [email protected] via the local server with Frontend Transport setup on it (hybrid Microsoft Exchange Setup).
If the email domain belongs to the server, ...
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dovecot: sync client mails to server
One of my mailservers stopped working and the mails seem to be lost. I have a copy of them (IMAP) on my smartphone, which unfortunately doesn't allow to export them.
My question is: if I set up a new ...
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2
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Add Multiple Subdomains In Signing Table And Key Table Opendkim
I need some major help adding multiple subdomains in the signing table and key table for opendkim without listing them one by one.
If I have 50 subdomains I want to add, it will take me forever.
I am ...
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Outbound proxy with multiple public IPs in Azure
For services where the outgoing (client) public IP address is important, such as email delivery - an HAProxy setup is often used to host the IPs, with MTAs driving the IP selection via Proxy Protocol.
...
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Multiple MX records with different domains - help prove me right [closed]
We use godaddy for our domain hosting. We had an MX record mail.caer.com.mailprotection.com.
Our IT consultant asked me to change it to d264b.ess.barracudanetworks.com.
GoDaddy told me I had to first ...
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1
answer
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Can iptables state miss some packets?
I tried to setup the iptable rules for MTA. As this MTA is meant only for receiving the emails I allowed INPUT packets from any to destination port 25 with state either new or established, and allowed ...
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77
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what comes first smtpd milters or cleanup in order of filtering in postfix?
Based on the documentation of the postfix (as stated here: 'https://www.postfix.org/SMTPD_PROXY_README.html') the smtpd milters should be used to filter the emails first and then the cleanup service ...
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192
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Milter Application Error Postfix Email Server
I am trying to sign the emails on my email server with opendkim but I am running against an error that I just can't seem to fix. The error I am getting is: warning: milter local:opendkim/opendkim.sock:...
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Dovecot not receiving mail while making use of vmail
Below is my current vmail configuration.
auth_mechanisms = plain login
auth_username_format = %n
protocols = imap lmtp
# Search for valid users in /etc/passwd
userdb {
driver = passwd
...
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0
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Issue with 'delay_reject=no' and smtpd_helo_restrictions in Postfix
In Postfix MTA, I have set helo and client restrictions with the DISCARD policy. But since setting delay_reject=no I am getting this error just after connect from for some clients (don't know if they ...
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What is meant by "Message sorting optimization records" in dovecot index?
Dovecot documentation here "https://doc.dovecot.org/developer_manual/design/indexes/index_file_format/#main-index" says that "Message sorting optimization records" are stored in ...
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What is difference between uidvalidity and list index file in dovecot?
Dovecot's document notation says that uid-validity file store IMAP UID to filename mapping but it also says list.index file also store same. If it's so what is need of two files.
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In postfix can I mention sender access map in client restriction?
It's a question out of curiosity rather than necessity. What should happen say I place sender access map inside smtpd_client_restrictions and also place client access map in smtpd_sender_restrictions ...
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In postfix how parent_domain_matches_subdomains helps rejecting mail for subdomains?
Based on the standard configuration given in https://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall the parent_domain_matches_subdomains = debug_peer_list, smtpd_access_maps should help ...
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How OpenDKIM decides which emails to sign?
In OpenDKIM, what domain does it consider to use when comparing to internal hosts? Do it consider the domain of Return-Path (i.e. envelope MAIL FROM's domain) or header From or HELO's domain.
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Why is it advised to disable relayhost when hosting mail server behind firewall?
I am trying to setup an MTA. While reading documentation I came across "Standard Configuration" for Running Postfix behind a firewall.
I am confused on this part:
IMPORTANT: do not specify ...
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Can I log when the message arrival rate exceeds the message delivery rate in postfix?
I am trying to implement a MTA, on reading documentation of the postfix I found a parameter 'in_flow_delay' whose description in sort says 'Time to pause before accepting a new message, when the ...
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What is behaviour of opendkim while verifying an email with multiple dkim signatures?
I am trying to implement DKIM verification using Opendkim and postfix. The doubt I am struck by is what will happen if the email has more than one DKIM signature and one of them fails (as like failed ...
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1
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What difference does it make to implement a feature as policy service vs as milter in Postfix?
I am trying to implement MTA using Postfix. I am struck at how to implement standard services like SPF, DKIM etc. as well as some custom services. They can either be implemented as policy delegation ...
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170
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What are typically the headers which I should oversign?
I am trying to setup MTA using Postfix and using opendkim for dkim signing. When I went through opemdkim documentation it have a field which is named 'OversignHeaders' document describes it as: "...
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What does "--[no]subdomains" option in opendkim-genkey mean?
Based on the documentation --nosubdomains "Disallows subdomain signing by this key". But didn't we need to create separate DKIM records for subdomains regardless?
Please correct me if I am ...
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2
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What is difference between using smtp vs relay transport type in postfix?
I am trying to setup MTA which should submit different intranet mail gateways based on the recipient's domain. For that I thinks transport_maps in postfix should be setup for selective domains; if ...
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How to restrict based on combined usage of sender email and client ip address in postfix?
I have a MTA (postfix) with sasl implemented. I want that for a subset of users I can map their email address to a particular range of ips (separate for each email user). If a user tries to send email ...
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Dovecot: Import from /var/spool/mail mbox to ~/Maildir
I've just migrated a personal mailserver from Courier MTA setup to a Postfix/Dovecot one. I thought I had it all worked out, but after I updated the MX record I realized Postfix was dumping mail into ...
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How to bypass postfix milters for certain users?
I am trying to set up an incoming MTA server using Postfix. I have specific requirements that some users' emails should not go through the milters. Is there any way this can be done in Postfix? One ...
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196
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Too many connect from unknown postfix
I am trying to set up an incoming email server by using postfix as MTA the issue I am facing is that there are too many 'connect from unknown' lines in the log. Can anyone help can I debug this issue? ...
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Permission problems with uWSGI and Modoboa
I have run a manual installation of Modoboa (https://modoboa.readthedocs.io/en/latest/installation.html#manual-installation), which runs a webapp in uWSGI. I moved the static content to /var/www/html ...
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OpenDKIM gets installed without RSA-SHA256 support
I compiled opendkim from source with the following commands:
mkdir /opt/opendkim
cd /opt/opendkim
wget https://sourceforge.net/projects/opendkim/files/opendkim-2.10.3.tar.gz
tar -xzvf opendkim-2.10.3....
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Perm Error sometimes not know if it sender issue or receiver issue
I am facing the problem, sometimes from the sender , i am able to receive the mail, sometimes it block, getting the error ---
Sender: @dekra.com
Recipient: @autodienst-hoppegarten.de
working header: ...
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Configure postfix virtual transport to deliver mail to arbitrary (local) addresses
I'm using Postfix in a very niche application with no inbound or outbound SMTP connectivity (other than via the loopback interface).
I would like to configure the postfix virtual transport to deliver ...
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dovecot maillog does not run or does not update after error appears
Dovecot maillog doesn't run after receiving an error like this, is there a solution to handle it? for email to run smoothly only maillog doesn't work, I've tried restarting postfix & dovecot, and ...