Unable to receive emails from gmail.com

Nanak

I have recently installed Mailcow. I have still my port 25 outgoing blocked by ISP it would be unblocking soon. as if now I’m unable to receive emails from Gmail, I am able to receive emails from Outlook ,Proton and yahoo. can some one help me troubleshoot this problem.

D4niel

What’s inside the Postfix logs when a mail is sent from Gmail?

Nanak

nothing related to receiving any email from Gmail but I found something odd. Only in gmail there is network is unreachable.

when sending email to gmail

05/16/2023, 06:35:44 PM	info	BE7BC16BF3E: to=<example@gmail.com>, relay=none, delay=77, delays=14/0.05/63/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4023:c0b::1b]:25: Network is unreachable)
05/16/2023, 06:35:44 PM	info	connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4023:c0b::1b]:25: Network is unreachable
05/16/2023, 06:35:43 PM	info	connect to alt1.gmail-smtp-in.l.google.com[2607:f8b0:400e:c00::1a]:25: Network is unreachable
05/16/2023, 06:35:42 PM	info	connect to alt1.gmail-smtp-in.l.google.com[173.194.202.27]:25: Connection timed out
05/16/2023, 06:35:12 PM	info	connect to gmail-smtp-in.l.google.com[64.233.170.26]:25: Connection timed out
05/16/2023, 06:34:42 PM	info	connect to gmail-smtp-in.l.google.com[2404:6800:4003:c1a::1a]:25: Network is unreachable
05/16/2023, 06:34:41 PM	info	disconnect from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
05/16/2023, 06:34:41 PM	info	BE7BC16BF3E: from=<ns@example.com>, size=988, nrcpt=1 (queue active)
05/16/2023, 06:34:38 PM	info	BE7BC16BF3E: message-id=<3d-64635c00-13-68653980@15010945>
05/16/2023, 06:34:38 PM	info	BE7BC16BF3E: replace: header Received: from 4b5a6ea437ab (mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network [172.22.1.248])??(Authenticated sender: ns@example.com)??by mail.example.com (Postcow) with ESMTPA id from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248]; from=<ns@example.com> to=<example@gmail.com> proto=ESMTP helo=<4b5a6ea437ab>: Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPA id BE7BC16BF3E??for <example@gmail.com>; Tue, 16 May 2023 16:04:26 +0530 (IST)
05/16/2023, 06:34:38 PM	info	BE7BC16BF3E: client=mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248], sasl_method=PLAIN, sasl_username=ns@example.com

when sending email to yahoo or others

05/16/2023, 06:32:20 PM	info	731B816BF73: to=<example@yahoo.com>, relay=none, delay=156, delays=6/0.03/150/0, dsn=4.4.1, status=deferred (connect to mta6.am0.yahoodns.net[98.136.96.75]:25: Connection timed out)
05/16/2023, 06:32:20 PM	info	connect to mta6.am0.yahoodns.net[98.136.96.75]:25: Connection timed out
05/16/2023, 06:31:50 PM	info	connect to mta5.am0.yahoodns.net[98.136.96.75]:25: Connection timed out
05/16/2023, 06:31:20 PM	info	connect to mta7.am0.yahoodns.net[67.195.204.79]:25: Connection timed out
05/16/2023, 06:30:50 PM	info	connect to mta5.am0.yahoodns.net[98.136.96.76]:25: Connection timed out
05/16/2023, 06:30:20 PM	info	connect to mta7.am0.yahoodns.net[67.195.228.94]:25: Connection timed out
05/16/2023, 06:29:50 PM	info	disconnect from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
05/16/2023, 06:29:50 PM	info	731B816BF73: from=<ns@example.com>, size=1011, nrcpt=1 (queue active)
05/16/2023, 06:29:45 PM	info	731B816BF73: message-id=<3d-64635b00-f-68653980@15010879>
05/16/2023, 06:29:45 PM	info	731B816BF73: replace: header Received: from 4b5a6ea437ab (mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network [172.22.1.248])??(Authenticated sender: ns@example.com)??by mail.example.com (Postcow) with ESMTPA id from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248]; from=<ns@example.com> to=<example@yahoo.com> proto=ESMTP helo=<4b5a6ea437ab>: Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPA id 731B816BF73??for <example@yahoo.com>; Tue, 16 May 2023 15:59:44 +0530 (IST)
05/16/2023, 06:29:45 PM	info	731B816BF73: client=mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248], sasl_method=PLAIN, sasl_username=ns@example.com
05/16/2023, 06:29:44 PM	info	connect from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248]

as I have mentioned my outgoing port 25 is currently blocked by ISP that’s why there is connection timed out. I think so

Typically, after 24 hours of attempting to send an email, Gmail sends a notification regarding the delivery failure. However, I have not yet received such a notification as it has not been a full 24 hours. but I will paste that information also.

Nanak

I think there is some issue with IPv6 but I don’t know what

Nanak

I have installed a new instance on DigitalOcean, and I’m encountering similar issues. I believe there may be a problem with how I installed and set up Mailcow. I will list all the steps I have taken below. Please assist me if you notice any errors in my process.

Welcome to Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-67-generic x86_64)

root@mail:~# sudo apt-get update -y

root@mail:~# sudo apt-get install apt-transport-https ca-certificates curl software-properties-common -y

root@mail:~# sudo mkdir -p /etc/apt/keyrings
root@mail:~# curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

root@mail:~# echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

root@mail:~# sudo apt-get update -y

root@mail:~# sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin

root@mail:~# sudo curl -L "https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 52.0M  100 52.0M    0     0  40.1M      0  0:00:01  0:00:01 --:--:-- 40.1M

root@mail:~# sudo chmod +x /usr/local/bin/docker-compose

root@mail:~# docker-compose --version
Docker Compose version v2.18.0

root@mail:~# hostnamectl set-hostname mail.dhanoa.co.in

root@mail:~# apt install git -y

root@mail:~# cd /opt

root@mail:/opt# git clone https://github.com/mailcow/mailcow-dockerized

root@mail:/opt# cd mailcow-dockerized

root@mail:/opt/mailcow-dockerized# ./generate_config.sh
Found Docker Compose Standalone.
Setting the DOCKER_COMPOSE_VERSION Variable to standalone
Notice: For an automatic update of docker-compose please use the update_compose.sh scripts located at the helper-scripts folder.
Press enter to confirm the detected value '[value]' where applicable or enter a custom value.
Mail server hostname (FQDN) - this is not your mail domain, but your mail servers hostname: mail.example.com
Timezone [Etc/UTC]: Asia/Kolkata
Which branch of mailcow do you want to use?

Available Branches:
- master branch (stable updates) | default, recommended [1]
- nightly branch (unstable updates, testing) | not-production ready [2]
Choose the Branch with it´s number [1/2] 1

root@mail:/opt/mailcow-dockerized# nano mailcow.conf

root@mail:/opt/mailcow-dockerized# docker-compose pull
                                                                             
root@mail:/opt/mailcow-dockerized# docker-compose up -d

Nanak

I finally received message from Gmail

The MX host does not match any MX allowed by the STS policy.