Questions tagged [email]

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

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Sparkpost SMTP: emails not being delivered to 0:mtccc-com.mail.protection.outlook.com

I have been hitting my head over this issue for 3 years now. We are a small ecommerce store using Sparkpost API to send email. We have problems sending email to outlook / hotmail / Microsoft365 ...
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29 views

Trying to set up Exchange 2013 server to migrate from Exchange 2010

I am attempting to configure a new Exchange 13 server to migrate from 2010. Here is what is done so far (Exchange 10 is the live server, 13 is the new one) Send/receive connectors between the 2 ...
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21 views

Don't use relayhost for a single domain (sender/from)

I'm trying to send one domain based on the sender (from) out directly to the mx of the recipient. However the following doesn't work: main.cf relayhost = ses.amazon.com ...
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44 views

EC2/EIP email flagged as spam

My company is delivering email out of an ec2 instance using Postfix, but messages are sent to the spam folder in all major providers (Gmail, Outlook, Yahoo). We have an EIP associated with this ...
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1answer
22 views

How can I bypass mailhog in Docker4Drupal?

I am using Docker4drupal, a preconfigured set of docker containers. One of the containers is the mailhog tool. Docker4drupal is configured to use mailhog as email sender so it captures all mail sent ...
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332 views

“unsupported dictionary type: pcre” postfix header_checks

I have the following header_checks in place on Postfix /^Received:/ IGNORE /^X-Originating-IP:/ IGNORE /^X-Mailer:/ IGNORE /Message-Id:\s+<(.*?)@www.mainserver.com>/ REPLACE ...
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18 views

Email limit on SMTP when the sender and receiver are under the same domain

In the company I work at, I have to setup our backend application to send a big amount of emails with updates to a customer (we have permission for that), but without using any 3rd party service apart ...
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1answer
8 views

SMTP Error, message appears in Sent folder, no bounce back

My mail client is reporting an SMTP error for a message it tried to send using a GSuite mail account. I know the connection generally works because it sends 100s of emails a day. Today I got this ...
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Exim 4.92 - vacation autoreply doesn't trigger

I'm trying to replicate example 2 from here, but for some reason the rule doesn't get triggered, and I suspect it even goes as far as dropping emails entirely when router is pushed first in queue. My ...
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17 views

Does an email send directly from original MTA to dest MTA? [duplicate]

Supposed I have an email server and I send an email to Gmail. From admin@myemail.com to someone@gmail.com. Does my email go directly to Gmail's server ? Or may it be relayed by other MTAs ...
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17 views

rfc3207 smtp starttls restriction confusion

From https://tools.ietf.org/html/rfc3207: A publicly-referenced SMTP server MUST NOT require use of the STARTTLS extension in order to deliver mail locally. This rule (1.) prevents the ...
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17 views

postfix outgoing smtp tls for some domains only

in a shared environment default value "smtp_tls_security_level=may" is may. but we have 3 domains that want to send out only tls secured mails. is it possible to select some of outgoing domains use ...
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48 views

Is port 25 used between mail servers secured with SSL/TLS?

Does port 25(smtp) used by MTAs work under plain text/non-encrytion ? I couldn't find any resources that state smtp with 25 by default is plain text. From Opportunistic_TLS (See the code section S:...
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23 views

how to setting BCC outgoing email for mulitple sender address to multiple address bcc with postfix

Hi i had the zimbra email server (using postfix for MTA system). I want to setting BCC outgoing email for multiple sender address to mulitple address bcc. I try follow step pre below URL on topic "...
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41 views

dmarc. Why do I receive failed SPF or DKIM authentication reports for forwarders?

I set _dmarc to see my email authentication reports (in case it fails). like that "v=DMARC1;p=quarantine;pct=100;rua=mailto:dmarcreports@example.com" And I receive these reports form Google. a ...
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Dovecot Pop3 Service Out Of Memory when not doing anything

We have several dovecot instances spread across several AWS regions all running on CentOS7. Since migrating to CentOS7, we have been seeing POP3 connections randomly crash with an out of memory error....
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Forwarding email with exim4

I cannot get exim4 to forward emails to name@mydomain.com to name@gmail.com. Here is what I've tried so far: sudo dpkg-reconfigure exim4-config General type of mail configuration: internet site ...
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Nginx SMTP Proxy to Mailcow Server

I have a couple of domains which I need to receive emails for. I have set up Mailcow and when I set the MX records of the domains to the Mailcow server. Email is received successfully. However, I ...
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1answer
21 views

exim acl_not_smtp ignored for local submissions

In the default exim4 install on Debian with split configuration files I have created a custom file at /etc/exim4/conf.d/acl/33_conf with the following content: acl_not_smtp: defer log_message = ...
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59 views

Deleting email that already sent and received by receiver

I'm kinda new and have the very basic knowledge for server, so I hope I'm not posting the question in the wrong place here. (and I'm not a native English speaker so bear with me) So the question is, ...
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56 views

How to reliably determine if an email has bounced

I send out a weekly newsletter to subscribers of my newsletter. I send email from noreply@example.com because I don't want people to be able to flood my own email box with replies when they receive ...
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37 views

Microsoft block email for no apparent reason [duplicate]

I manage a couple of servers and 3 of them got flagged the same week by Microsoft and block all email these servers send and we get these errors : 550 5.7.1 Unfortunately, messages from [xxx.xxx....
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41 views

Abuse report for an email message from amazonses.com

I'm an AWS SES user. I'm getting emails from complaints@email-abuse.amazonses.com with this message: This is an email abuse report for an email message from amazonses.com Based on this Why do I ...
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1answer
28 views

PostFix+Dovecot: Case Sensitive Email Address

So I'm having a problem with my email server configuration. I setup my server using this guide. It works great my only problem now is that the email address is case sensitive. I understand why that is ...
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39 views

DNS records - custom imap domain URL using my domain

I want to setup a custom email imap domain name as a DNS record that points, for example, imap.mydomain.io to imap.google.com, so that I can give imap.mydomain.io url to my email customers. This is ...
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Can't email GSuite users from my email server

I host the website for studio9architecture.ca. (CentOS 7.6.1810 / qmail 1.03) That company uses GSuite to manage email. None of the users in that GSuite account can receive email from any email ...
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1answer
25 views

sendmail command executes without error but not actually sending mails

I am trying to send emails from my ubuntu server using sendmail command. I ran command echo "Subject: Sendmail test" | sendmail -v <My_Id>, which ran without any errors but still I don't ...
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16 views

Slow mail sending from Excel, fast when attaching manually [migrated]

I have recently issues with email sending directly from Excel (save & send function). It quickly attaches mail to outlook window but when I press 'Send' button I have to wait 30-60 seconds If I ...
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1answer
47 views

Unable to receive mail from the amazon network

I currently have several servers at OVH including one that acts as a personal mail server. Postfix takes care of receiving the mails, but I have a problem for the reception coming from certain domains....
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45 views

What are the ramifications of corrupted/lost index files in Dovecot's dbox storage format?

The Dovecot documentation for the dbox storage format gives a couple dire-sounding warnings about corrupted or lost index files: One of the main reasons for dbox's high performance is that it uses ...
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1answer
62 views

Laravel 5.5 Send Mail with Sendmail driver CentOS [Connection timed out]

I'm trying to send emails with sendmail driver but it isn't working and I got no errors. My .env file: MAIL_DRIVER=sendmail MAIL_HOST= MAIL_PORT=587 MAIL_USERNAME=null MAIL_PASSWORD=null ...
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Postfix/dovecot mail location doesn't effect

Well i tried to changed or fix issue or directory while receiving a new email, which i want to make the location to whatever the mail to be in that respective user's home dir mail folder. currently ...
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1answer
48 views

Exchange: Universal Postmaster Setup

I have an exchange server and around 200+ accepted domains (managed service company). I would like to set up a catch all for postmaster@* I tried doing so via transport rules, but exchange seems to ...
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22 views

AWS SES SMTP forward all outbound emails to another SMTP server

I'm using AWS SES SMTP to send emails from a Laravel application. I'm sending emails to a certain organization which only have limited licenses and email accounts that have incoming emails enabled ...
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1answer
20 views

Using both GSuite and third party email hosting

Is it possible to use 1 domain that running simultaneously with 2 email hosting / services? I mean in my company, a management level will using g suite. On other hands, a staff level just using email ...
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18 views

Exim default sender address

I would like to set a default MAIL FROM address for my Exim MTA in order to not specify it explicitly when I send an email. Currently, I send an email like this echo 'test mail' | mail -s test -r ...
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1answer
100 views

DMARC test failed but we didn't find any obvious reason why; DMARC not passing while SPF and DKIM do

About 7 days ago, I found out on https://www.mail-tester.com that sometimes (50% of my tries over a couple of days) my company email does not pass DMARC test. As it states it does not know why, I am ...
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12 views

Delivery Status Notifications not being retried

I was checking my ISP's Out of Office reply system and I found that although they sent a message to my server, because my server replied with a 4xx error code, the server did not attempt to re-deliver ...
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42 views

Updated MX Record Causing Bounce

We recently migrated our company to a new mail provider (Gmail), and updated our MX/SPF/DKIM/DMARC records. Checking the DNS propagation via https://dnschecker.org/, all changes are reflected. ...
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1answer
43 views

server listed in backscatterer twice in 2 months [closed]

My server was listed twice in a 2 months time window in backscatterer.org blacklist, for a low severity. I'm not finding anything about the reason of blacklisting. Would there be anyone to help me to ...
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1answer
46 views

FreeBSD: system is sending mail for any user to an external smtp - why?

There is a problem with one of my jails. All Jails sending their mails for root to root, except one jail (nginx). This jail sends mails to root@jailname.domain.tld. My Postfix is configured to accept ...
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1answer
34 views

OpenBSD 6.5 /etc/mail/aliases correct format?

What is the correct entry format for an alias? Right now I have root: xxxx@somewebsite.com Running newaliases -f /etc/mail/aliases yields a syntax error. Are there examples in the manual page ...
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1answer
50 views

How to create email list in exchange 2010

I would like to create some kind of email list in exchange 2010. From user side, it will look as something like this when they create message: Group_1 Group_2 Group_3 When user click on the list ...
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8 views

IMAP email not persisting read status and reply status - what could be the likely cause?

So I have the following setup: IMAP mail from TransIP (a pretty big host in the Netherlands) Thunderbird on my PC Mail on IOS phone Frequently when I'm reading emails on my PC they are being marked ...
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1answer
39 views

Is it possible to receive mail on the internet without an MTA? [closed]

I just need to be able to receive email on my Debian server, not send it. How can I do this with the lowest memory/CPU footprint? Do I still need a full MTA?
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31 views

Reverse DNS Not Working on some Email servers

We host our email on an internal server. Recently we have started getting bouce backs from various other servers. Most seem to have the following error: Reason: Remote SMTP Server Returned: 550 ...
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37 views

What does gmail response “Requested action not taken: mailbox unavailable (in reply to MAIL FROM command))” means?

When out of office mails from our company go to a gmail address, we get this error in return: May 2 12:59:29 lg-info-mail postfix/smtp[22620]: AB34490FD1: to=, relay=gmail-smtp-in.l.google....
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36 views

Postfix/dovecot can send, but does not receive mails

I have a VPS server, it worked like email server from 2015, but I reinstalled the Debian OS. (Old version 7.6, the new is 9.8) Before I reinstalled the OS, i backed up the postfix, dovecot, ...
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1answer
40 views

People complaining about undelivered emails - AWS says the provider returned SMTP 250 code

We have several users that complain about not receiving only some of the emails our webservers send through AWS Simple Email Service. Most of those users not receiving emails are users with hotmail.fr ...
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1answer
79 views

Email sending issue with “localhost.localdomain”

I have a DigitalOcean server which runs Ubuntu 14.04. I am having problems with sending emails from the PHP mail() function (which uses sendmail internally). I think the issue may be related to my ...