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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.

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.

A list of mail servers can be found on Wikipedia, though sendmail, Microsoft Exchange Server, Postfix, and Exim are the most popular email servers, which together control over 85% of market share for SMTP service.

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After adding a new DNSBL to Sendmail, how can I resubmit an email to see if it will be rejected?

TL;DR How can I fool my own sendmail into thinking an email comes from a particular ip address, so that it rejects the message due to a DNSBL match? Details: I run my own mail server, and most spam is blocked by the DNS black lists (DNSBL) that I've…
PFudd
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Postfix + Dovecot and folder "sent mail"

We’re using for sending mails our own mail server Postfix + Dovecot with parameter for Postfix sender_bcc_maps which ensures that sent mail thanks to blind copy (BCC) is also sent to a sender’s address „sender+sent@email.domain“. That way is mail…
Nichlaus
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Multiple Servers + One MailServer

Hy, I got several Linux-Servers (running Debian) where different services run: Database-Servers, Webservers, Applicationsservers, Tools and so on. All Servers are connected to the same internal network. There is also one special Server which is the…
theomega
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Postfix / Dovecot can't send or receive e-mails in Ubuntu 20

I've generated ssl files using letsencrypt and everything is installed and configed but my IMAP and SMTP are not working. What I can find from the /var/log/mail.log file is this error: dovecot: imap-login: Disconnected (disconnected before auth was…
Top Stars
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Fetchmail does not use the indicated protocol

I'm trying to setup fetchmail for download some mail from gmail using pop3. The problem, as you can see, is that fetchmail instead of use the pop protocol will use imap. For being sure to not have commit any error during the configuration i will…
DottorBooom
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Clarification on the configuration of a mail server

I would like to start by saying that I have not seen any other forums or posts that clearly explain this thing. If there are, my poor English skills probably didn't make me understand the solution clear. As you already understood, I am trying to set…
DottorBooom
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Why does my postfix reject mail with a spf hardfail even though spf DNs record is set to softfail?

The log output I get is the following: "Jul 7 11:23:46 mail policyd-spf[19779]: 550 5.7.23 Message rejected due to: SPF fail - not authorized. Please see http://www.openspf.net/Why?s=mfrom;id=xyz@gmx.de;ip=;r= Jul 7 11:23:46 mail…
Big X
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Balancing with MX records - How does this work?

enter image description hereplease can you help me with this, I have this scenario to balance email traffic, currently, most of the emails are going towards imail2.test.com.pe and imail.test.com.pe and some fewer towards imaill3.test.com.pe and…
Anthony J. B.
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Postfix not receiving external mail and local mail stuck in queue

I have an issue that I can't find solution for. My Postfix server crashed, I re-installed it, but now, and no matter what I do, I can't get it to forward incoming emails to its designated domain. I can send among local users. This is from…
Home Plus
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Postfix not sending emails to external domains from mailing client

I have just finished setting up postfix and dovecot on my virtual server. I am able to send emails to external email addresses from my Linux console using mailx but when I try to set up mail account on outlook or any other email client then the…
Albert Lilly
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Restrict outgoing email from some subdomain to internal domains only using postfix

I am new to email servers and after some time and hard work I managed to configure a mail server, all the certs, all the ports etc... Everything is working really fine! And now I was requested to create an internal subdomain so that the email…
Just a nice guy
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Using Office 365 with Linux mail clients

Our company is moving to Office 365. We would like to provide access to Office 365 from Linux workstations (Ubuntu 18) so that employees can keep their mails/drafts offline use a better GUI than the web front-end (tree views of mail threads, key…
Sun Wukong
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Postfix/Dovecot - User unknown in table, setting it up with /etc/virtual/domain/passwd

I'm trying for two days to replace Exim with Postfix. I'm able to log into my mail account and send mail from localhost to another sever with telnet, but i cannot send anything to my postfix/dovecot server. I'm getting "User unknown in local…
Matwag
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postfix limit sending rate PER MX domain?

I know postfix can limit concurrent connections to recipient "domains", but I am sending emails to websites from different domains that may use the same email service (Google, Outlook, etc.) for the MX domains. Is there a way to limit the sending…
rosstex
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Google Postmaster: IP reputation of subdomain and main domain identical

We have a main domain, example.com. We use this to send regular emails via Google GSuite. We also have a subdomain, say sub1.example.com. We use this to send campaign emails through an email marketing service (Zoho Campaigns). I would expect the IP…
Damnum
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