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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 do I backup email messages in Dovecot? Where are they located in the file system?

I run Postfix with Dovecot. Now I need to begin to backup email messages. What directories should I backup? Such that later, if a server breaks down, I'll be able to restore all the email message on a new server with Postfix and Dovecot.
karneliy
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Australian-based email server for a small-medium email reseller?

We are primarily a web design and web development (Australian-based) agency. We currently have a great server manager who we want to stick with for all our web hosting. We have around 400 client accounts. However, our server manager is not keen to…
Monkey Puzzle
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Nextcloud Mail not accessible using TLS

I configured my mail server on my server using Postfix and dovecot. SMTP and IMAP Server works well whan using the commands openssl s_client -connect localhost:143 -starttls imap and openssl s_client -connect localhost:25 -starttls smtp. I used…
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Understanding SPF fails for email sent

I'm trying to get my head around this issue. My emails are getting sent into spam for people. In this case, its gmail. If I look at the email details I get: 109.74.201.130 is another server, which hosts ultranerds.co.uk. This is the SPF record I…
Andrew Newby
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Implement Policy Filter Rule on Open Source Mail Server

I have an old mail server in Linux 3.9.3. And according to its Server Monitor Page. It seems an integrate of postfix, dovecot, apache, etc. Due to its ancient version and not under maintenance web interface and limited hardware. I decided to migrate…
WildfootW
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emails to Yahoo are ending up in SPAM folder despite spf=pass, dkim=pass and dmarc=pass

Are we possibility having a reputation problems with Yahoo emails? Yahoo raw mail header finds my policy I published: dmarc=success(p=REJECT,sp=REJECT) Emails to clients at Google and Outlook are not ending up in spam, but Yahoo is. Finally a week…
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Reverse DNS is not a valid Hostname with existing PTR record matching HELO/EHLO

There are a ton of questions related to this issue - and I have gone through almost each one yet this issue persists and I have no idea how to proceed further. My mail server is setup with postfix, I have the corresponding A/AAAA records, etc setup…
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Emails determined as junk email by outlook with dmarc, dkim, spf, etc verified

I am hosting email on my own server that has SPF, DKIM & DMARC all passed. Problem: When sending out emails, GMail receives the email and confirms the security information matches, is valid and passes. Using free tools such as MX Toolbox & gsuite…
CybeX
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Email does not reach external mail server (postfix)

I have a mail server on mail.domainA.com which is working absolutely fine if I send email to name@domainA.com. I then configured a second domain (domainB.com) in bind9 (same server) to use mail.domainA.com as the mailing server. However, when I send…
nix
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FQDN for a postfix/dovecot virtual machine inside host with a single public IP

I want to install iRedMail (== postfix + dovecot) in a virtual machine inside an internet-facing host with a single IP. The host is named host.mydomain.com with IP 1.2.3.4. The PTR record for 1.2.3.4 is set to host.mydomain.com The SMTP/IMAP ports…
Erion
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Postfix Conf - Unknown user

Can't receive emails for virtual users but they can send. UNIX users that can receive and sent. What am I doing wrong? root@localhost: postconf -n append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes compatibility_level =…
Jason Frank
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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 machine on the same physical server as the…
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How can I replace part of a body with an empty string using Postfix?

I've set up a Linux server running Postfix that I'm using to send and relay emails, and one of the tasks that my mail server does is take incoming emails that are sent to specific addresses and forward them to email addresses that belong to another…
AndreasKralj
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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 keeps deferring my emails, so users can't get…
thenondeveloper
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PMTA Timeout Centos 7

I have an issue with PMTA which not sending any emails from my server and all connections with others are timeout! Timed out, status = ETIMEDOUT while connecting from subdomain. …
Kareem Connor
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