Questions tagged [postfix]

Free and open source mail transfer agent (MTA) that routes and delivers email. When asking about postfix problem, please include the relevant maillog lines and output of the following command: `postconf -n` (non-default content of main.cf) and `postconf -M` (content of master.cf)

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i cannot login to IMAP/POP3 from different location

[Please read before marking as duplicate] I have installed Postfix and dovecot on Ubuntu (for virtual Users). So i can login into the mail server from home using cellphone(mail app) and even on ...
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42 views

Linode postfix/dovecot/mysql mail server does not receive mail or work with IMAP

I recently set up a mail server on a CentOS 7 Linode, with all config according to this tutorial. After finishing setup, I used the mailx passage and sudo mail example@example.com to send an email to ...
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1answer
33 views

Is firewall-cmd/iptables needed on an EC2 Amazon Linux 2 for email if using Security Group?

I'm trying to install and configure Postfix/Dovecot on an EC2 instance running Amazon Linux 2. The documentation I've run across so far talks about opening ports using firewall-cmd or iptables on the ...
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1answer
42 views

sslv3 alert bad certificate when attempting to connect with Mail Client

I have a Debian vServer with a pre-installed Froxlor. Froxlor uses Dovecot and Postfix for mailservers. I set up 1 catchall email address which forwards all messages to my private mail. This is all ...
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1answer
43 views

How do I update Postfix .db files after removing unwanted emails?

I know almost nothing about setting up email, and have inherited an old Ubuntu 6.10 server with live sites and active email. I'm concerned about upgrading Ubuntu without checking this first. It's ...
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30 views

How to filter postfix mail before relay to Offfice 365

I have a Postfix server on CentOS 7 that can receive mail from my network on port 25 without auth and relay it to Office 365. Without any restriction, encountering infection on the network, ...
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1answer
87 views

Someone is scanning my postfix/dovecot

There is someone scanning my mail server. What can i do to block them? i tried adding this and is not helping: /etc/hosts.deny ALL: 80.82.77.18 i see this in the log: ... Aug 23 03:34:40 auth-...
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25 views

can't receive email in exim system

i have exim on directadmin system. then i had a little bit issue about external domain incoming email. that can't receive email (csd.hlag.com only!!!) it not such in the my inbox / junk or etc ...
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1answer
145 views

Postfix: ACCEPT if RBL and SPF checks pass, DUNNO/greylist otherwise. How to do it?

I would like to accept all clients that pass RBL and SPF checks (and possibly some checks, but these are minimum requirements for me), and greylist those who don't. When a client passes the SPF check (...
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0answers
89 views

Fail2ban does not work for postfix “NOQUEUE: reject”

My postfix instance (Debian 9) is under permanent attack from spammer bots trying to use it as an open relay. I have fai2ban up and running and it works perfectly against SASL attacks, but I cant get ...
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35 views

How to allow Postfix to send on behalf of a domain using DKIM?

I have two servers: web and mail. The web server runs Apache and Postfix. The mail server runs Mailu, a bundle of preconfigured tools (Postfix, Dovecot, rspamd, etc.). The mail server hosts several ...
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36 views

How to transfer Mail Server from Apple to CentOS using postfix

I would like to take the mailboxes from my apple server ("Old Server") and put them on my centOS server ("New Server"), without much if any downtime. They both have the same MTA: postfix. Now, not ...
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70 views

Dovecot/Postfix Error: connect failed to database

I have a question and I hope you can help. I have an email server setup and running. A few days ago the following updates were installed: 2019-08-15 22:23:40 upgrade php-common:all 2:69+0~...
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1answer
81 views

How to Block a Domainname with random TLDs in Postfix?

Can anyone please tell me how to reject all domains with a particular name, but regardless of the TLD? I want to block all mail coming from domains named bulksender, like bulksender.com, bulksender....
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21 views

Certificate failure for mail.domain.com: self signed certificate: /CN=mail.domain.com when create a new mail in Rukovoditel 2.5.1

I installed a fresh Rukovoditel 2.5.1 and after setup the mail account, I found the error in the the subject. Below the setup details for the email: Receiving mail Mail Server: mail.domain:993/imap/...
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49 views

Postfix GMail bouncing with “very low reputation of sending IP” [duplicate]

i'm using a Debian 9 with Postfix and i've got issues with my mails sending to google mail. After sending a mail, i will instantly get a response: "Undelivered Mail Returned to Sender". Our System ...
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0answers
39 views

Why/When are some rejected mails not listed in rspamd history

I am seeing mails which are greylisted/rejected by rspamd according to the postfix log which are not shown in rspamd's GUI history. I have two questions: Which are the general cases when mails are ...
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17 views

How is an email password change logged in a postfix/dovecot system?

I've got an email user whose email password has been changed in the last day or so, but he doesn't know how it happened. The system is Debian Stretch postfix/dovecot. How is such a change in an ...
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50 views

Zimbra Google suite on Split Domain

We are trying to set up Zimbra Community Edition along with Google G Suite on a split domain mail system. We have Google as primary, while Zimbra is secondary. We have referred this document or the ...
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1answer
56 views

I have set up Spamassassin. Only outgoing emails are scanned by spamassassin and not incoming ones

I have set up spamassassin with postfix. The problem is I tried testing the spamassassin default filter by sending the GTUBE spam test email from gmail to my mail server. Spamassassin is not even ...
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32 views

Incoming emails with postfix get error 530 client not authenticated

my ubuntu 18.04 can actually send email with s-nail and it's working fine. I've setup and posconf'd a letsencrypt wildcart cert. cat t.txt | s-nail -s 'super object' -r'contact@happy.property' ...
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26 views

Unable to block emails from Mailer-Daemon@some.externalserver.com with Postfix

I am receiving tons of emails from a mailer daemon on the server of a client I worked for years ago (the emails are from Mailer-Daemon@some.externalserver.com). The emails are spams addressed to an ...
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1answer
82 views

Emails going to spam even though DKIM and SPF records set up and rDNS too in EC2. I am usinf postfix and dovecot [duplicate]

I have set up my own email server in AWS using postfix and dovecot. I have also set up DKIP and SPF and DMARC records. Now the problem is when i send an email from admin@example.com, its not flagged ...
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1answer
34 views

Why is postfix not receiving mail in /var/spool/mail?

I am on CentOS/EL7 AWS Lightsail host trying to configure postfix to deliver incoming mail to user accounts. However, I am not yet to the point where I see the mail arriving in /var/spool/mail/*. A ...
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1answer
30 views

Postfix relay outgoing emails based on recipient

I'm having trouble with Microsoft rejecting all our emails, I've contacted the Outlook.com Deliverability Support 3 times and 3 times they've told me that there's no problem with our IP and that I ...
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1answer
31 views

OpenDKIM generates 2 keys

I've followed instructions to set up spf and DKIM on my mailing server. SPF is working fine so far, however I am having problem with DKIM. In every single instruction website, they show the output ...
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13 views

macOS High Sierra Server mail services /usr/bin/log weirdness

With /usr/bin/log I can get information about the mail services from macOS's log system. E.g. /usr/bin/log show --start '2019-08-07 12:50:59' --end '2019-08-07 13:00:59' --predicate '(process == "smtp"...
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2answers
64 views

How to REJECT email using SpamAssassin

Is it possible to reject emails, like it is done in Postfix using header_checks, using SpamAssassin? Normally, the SpamAssassin only adds the spam flags and by default adds the word SPAM in the ...
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14 views

Postfix check how many emails a user is trying to send before queuing them

I have Postfix installed, and set as a send-only smtp server, on a VPS(running ubuntu 18.04). Now I want to limit a user to 100 emails/day(if possible saving that limit - sent and remaining - inside ...
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14 views

Cloning SMTP traffic and processing it

Got Production and Testing enviroment (runs on CentOS, Postfix server - as a "mail security" relay) # Goal: Want to copy traffic from production to testing enviroment to test policies. Cannot find ...
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1answer
34 views

DKIM & SPF records should be on the sender email domain or on the smtp domain?

I have two(2) vps servers. One of them hosts my website and the other has Postfix installed on it. VPS[1]: websitedomain.com VPS[2]: postfixdomain.com I am using smtp.postfixdomain.com to send an ...
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18 views

Postfix - cannot send mail to specific domain

I have a web app that sends out account confirmation emails to people who register for a user account. Following this Linode tutorial, I have set up my box's SPF, DKIM, and DMARC. Postfix itself is ...
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0answers
125 views

How to add X-sender and X-receiver to message header with postfix header_checks?

How can I add 'X-sender' and 'X-Receiver' to incoming messages with postfix, if these headers are not already present in the arriving message? Similar to Microsoft Exchange header injection: For ...
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0answers
39 views

Postfix Catchall Not Working

I followed this tutorial to set up Postfix on Ubuntu 18.04. Please assume that the server has an IP address my.ip.add.ress (I've hidden my IP address and email addresses in this post). At this point, ...
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13 views

Why does postfix not let me send directly to a user, but the alias works?

I have these entries in my /etc/aliases file on my main site, example.com: scott: admin@otherdomain.com payment_support: scott If I email payment_support@example.com, it is correctly ...
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1answer
55 views

554 5.7.1 <user@domain.com>: Relay access denied

I've looked at the postings for this similar issue and tried the suggestions with no luck. Please help me figure out why no emails can be received by my postfix server. I have my MX record ...
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1answer
59 views

How to identify mail user from Syslog and mail.log? [duplicate]

I have a user on my system who appears to be sending large quantities of mail and I'm having difficulty identifying who he is. I don't know his IP address or username by which he authenticated. One ...
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2answers
148 views

Mailcow (postfix) - allow sending unencrypted mails (SMTP port 25)

How can I allow to send unencrypted mails using SMTP port 25 with (plain text) password authentification - without SSL/TLS? I need to enable this, because I have some old IP cameras that are not able ...
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1answer
29 views

Is it possible to use Gmail as a postfix relay with virtual domains?

As I'm getting more and more frustrated with attempting to use sendmail to send web app emails that won't be flagged as spam, I've turned my attention to using postfix instead. I've found this Linode ...
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9 views

How to forward alias but not entire mailbox?

I'm using postfix + postfixadmin + dovecot Is there a way to have a mailbox named me@domain1.com and an alias named me@domain1.com but have that alias point to some other mailbox someoneelse@domain2....
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1answer
100 views

NOQUEUE: reject: RCPT from 451 4.3.5 Server configuration

Unfortunately after some changes on master.cf and main.cf in postfix I'm getting these errors when I try to send out a e-mail. root@mail:/etc/postfix# tail -f /var/log/syslog | grep "rene.brakus@...
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24 views

Check revocation of client certificate in Postfix

I've configured Postfix to require client certificates, like this. smtpd_tls_ask_ccert = yes smtpd_tls_req_ccert = yes smtpd_tls_CAfile = /etc/postfix/tls/example-ca.pem smtpd_tls_ccert_verifydepth = ...
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1answer
102 views

Misconfiguration of master.cf or main.cf

I have folishly played around with master.cf and main.cf without creating a backup first on postfix and somehow managed to make it so I can't send or receive e-mails anymore. I'm getting the following ...
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0answers
56 views

Postfix: routing applyed to wrong recipient when using check_recipient_mx_access

i am using check_recipient_mx_access so I can route all office365 hosted or google hosted domains to a special email gateway [because SPF, DMARC, so on]. smtpd_recipient_restrictions = ..., ...
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2answers
99 views

change relayhost depending on mx for destination domain

I am used to configure transport_maps so I can control which relay to use for specific domain. I would like to change the relay or the route depending on the resolved MX, because a lot of domain are ...
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0answers
58 views

Postfix: rewriting the recipient domain on relayed mail

I have a mail relay (mx2.mycorp.com)which accepts mail for somelist@lists.mycorp.com. These posts are forwarded to a Sympa mailing list server which accepts postings for the mycorp.com domain. This ...
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46 views

Getting dnsmasq and unbound working together

I run a deep web mail provider and to do this I use unbound on a system behind a gateway which is a transparent proxy for Tor. I also use redsocks, and unbound sends connections to other mail servers ...
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1answer
639 views

Refused to talk to me: 521 connection rejected

I have a Zimbra mail server running on a dynamic public IP. The incoming and outgoing mails are relayed through a AWS ec2 instance(running postfix) that has a static public IP. The AWS instance has ...
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30 views

Postfix forward on Ubuntu Server 16.04

Iam using Postfix 3.1.0 under mysql. Incoming e-mails to info@example.com will be with sql and the tablet 'virtual_aliases' also send to the archiv@example.com I would like that the incoming ...
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0answers
34 views

opendkim-testkey returns 'multiple DNS replies for 201907._domainkey.example.com' [duplicate]

I am installing opendkim in my POSTFIX mail server on a ec2 with an ubuntu 16.04 xenial by fallowing This guide in linode. I've set a txt DNS record named 2019._domainkey.example.com with the key ...