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.

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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 ...
Rom Pereira's user avatar
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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 ...
Tacioandrade's user avatar
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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 ...
mhbeyle's user avatar
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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: ...
triatic's user avatar
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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 ...
Marijn Ophorst's user avatar
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162 views

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 ...
InterLinked's user avatar
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2 answers
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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 ...
lairdb's user avatar
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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 ...
SUNITA GUPTA's user avatar
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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-...
John Sall's user avatar
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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 ...
Demetris's user avatar
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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@...
mwarble's user avatar
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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]: ...
mohamad zbib's user avatar
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253 views

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 ...
Amir Eix's user avatar
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1 answer
99 views

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 ...
Phi's user avatar
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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) =&...
Dr. Gianluigi Zane Zanettini's user avatar
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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 ...
rfmoz's user avatar
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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 ...
atapaka's user avatar
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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 ...
ARGYROU MINAS's user avatar
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1 answer
67 views

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 ...
Ronnie Overby's user avatar
1 vote
1 answer
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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, ...
artickl's user avatar
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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 ...
user236012's user avatar
2 votes
2 answers
372 views

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 ...
Digital Joe George's user avatar
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1 answer
222 views

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. ...
tuck1s's user avatar
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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 ...
ActuallynotIT's user avatar
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1 answer
36 views

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 ...
Ayush Gupta's user avatar
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1 answer
76 views

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 ...
Ayush Gupta's user avatar
0 votes
1 answer
189 views

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:...
Niels Koop's user avatar
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0 answers
96 views

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 ...
root-louis's user avatar
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64 views

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 ...
SUNITA GUPTA's user avatar
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1 answer
21 views

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 ...
Ayush Gupta's user avatar
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0 answers
44 views

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.
SUNITA GUPTA's user avatar
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1 answer
117 views

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 ...
SUNITA GUPTA's user avatar
0 votes
1 answer
77 views

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 ...
SUNITA GUPTA's user avatar
1 vote
1 answer
127 views

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.
Ayush Gupta's user avatar
1 vote
1 answer
170 views

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 ...
SUNITA GUPTA's user avatar
1 vote
2 answers
44 views

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 ...
Ayush Gupta's user avatar
0 votes
0 answers
48 views

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 ...
Ayush Gupta's user avatar
2 votes
1 answer
94 views

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 ...
SUNITA GUPTA's user avatar
1 vote
0 answers
169 views

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: "...
Ayush Gupta's user avatar
0 votes
1 answer
123 views

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 ...
Ayush Gupta's user avatar
4 votes
2 answers
541 views

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 ...
SUNITA GUPTA's user avatar
2 votes
2 answers
168 views

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 ...
SUNITA GUPTA's user avatar
0 votes
0 answers
160 views

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 ...
goldilocks's user avatar
-1 votes
1 answer
154 views

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 ...
SUNITA GUPTA's user avatar
0 votes
1 answer
196 views

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? ...
SUNITA GUPTA's user avatar
0 votes
0 answers
58 views

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 ...
daydr3amer's user avatar
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0 answers
216 views

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....
daydr3amer's user avatar
0 votes
0 answers
31 views

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: ...
BOURN's user avatar
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1 vote
1 answer
177 views

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 ...
larsks's user avatar
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29 views

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 ...
reaquan's user avatar

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