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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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How to configure EXIM to check SPF record for incoming emails and add 'Received SPF' header to the incoming emails?

I'm playing with Exim and created a mail server that can accept and send emails alright. Now, I want to enable SPF checking for every incoming email so that a Received SPF header is added to these emails. But I can't seem to figure out a way how to…
Md. Ishtiaq Ashiq Khan
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Procmail not bouncing emails

I have a catch-all email address for my domain, however I want to block certain addresses from receiving mail. Before, I was doing it like this: :0 * ^(X-Original-To): username@example.com /dev/null This works fine, however, the email is silently…
Mike
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Meaning of "sender"?

Reading documentation about SPF records, I can't quite seem to disambiguate the meaning of "sender". It could mean "the IP where the mail client sent the message" or it could mean "the IP of the mail server that the mail client is contacting". So,…
Dave Cousineau
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email validation: is there any point doing both SPF *and* reverse DNS tests?

For a receiving MTA, it seems to be unnecessary to check both the SPF record for an incoming SMTP connection, and to do an rDNS/PTR lookup. Consider: Server gets SMTP connection from aaa.bbb.ccc.ddd, with (possibly spoofed) MAIL FROM claiming to be…
QF0
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How do I make exchange forward email to a non-exchange mail server (postfix on mac)?

I'm not sure what I'm doing. Exchange has been working a long time. I just installed a mac mail server postfix/dovecot. They both work but not together. If I send email directly to the new server with myemail@mynewmacserver.com, I can send email…
johnny
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Postfix owner mail loop 'owner-owner-owner-owner-owner-owner-owner...'

Our postfix logs are being filled with messages that appear to be stuck in the mail queue. I believe this may have been caused by a recent DNS outage. The offending mail was originally intended for node@hostname but postfix was unable to resolve its…
SystemParadox
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postfix: how to force IPv4 through SMTP?

Problem I have successfully set up a Postfix mailserver with an SMTP interface, set up DKIM, DMARC, SPF, all that stuff. But I had a problem when testing the delivery of emails to Gmail. Namely, SPF would pass if I sent it by the sendmail command…
VaNa
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How do I automatically BCC received mail to multiple users in Postfix?

I am trying to link up a dummy email address to two different email addresses: contact@example.com -> user1@example.com and user2@example.com This would mean that mail sent to contact@example.com would also get BCC'd or forwarded to…
Kārlis Čerņavskis
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Added dkimproxy to OpenSMTPD ... mail loop when sending to my own domain

I have a nicely working OpenSMTPD configuration and I added dkimproxy to it. Everything is working nicely and mail-tester, etc., all report that I have proper DKIM signing and my email score is 10/10, etc. The problem is ... If I attempt to send an…
user227963
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Postfix unintentionally rewriting email addresses with virtual domains

I have had a postfix mail server running for some time mostly just taking mail for a couple of personal domains for me. I was recently asked if I could email services for a family member, and I'm having a bit of trouble setting everything up. If I…
M1GEO
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Dovecot quota - infinite loop when mailbox full

We get an infinite loop once quota is exceeded. Having set up the dovecot quota as per https://doc.dovecot.org/configuration_manual/quota/ Here are the parameters I modified (my setup was working with no concern): 90-quota.conf plugin { quota =…
user3450564
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DMARC failure for delivery report

I have a Docker-based mail server (Mailu) setup. It's working great except for delivery reports which are sent automatically (one of the user mailboxes is full and a "Quota exceeded" notification is sent to the sender). The reports are rejected by…
andi
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Weird mail problem

There is a weird problem that I cannot think of any solution. There is a mail server Xs that has couple of domains on it and it is in Datacenter Xd. And there is a mail server Ys that has couple od domains also in another Datacenter Yd. For only 1…
Harun Baris Bulut
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Postfix tries to lookup external address locally

I am currently trying to set up a mail server using postfix, dovecot, amavis, sqlite, etc.. Lets say I have: mydomain.com and mail.mydomain.com (MX record points here) When sending an email to an external mail address (lets say mymail@gmail.com),…
babulb
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Amazon SES - Domain Verification Pending

I am trying to setup Amazon SES on my Route53 domain (writeurl.com). The domain verification status remains at pending verification and does not proceed. The following nslookup command does not show anything, even though the records are created in…
Haris ur Rehman
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