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Email unable to send, but can receive

Posted August 14, 2020 341 views
Email

Got some issue with my newly setup droplet. Looks like I can’t send any email to any address. Below is one of the testing I’ve made.

This is the mail system at host vps.paskal.my.

####################################################################
# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
####################################################################

Your message could not be delivered for more than 4 hour(s).
It will be retried until it is 5 day(s) old.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<mizi@iwhost.com>: connect to iwhost.com[103.8.24.2]:25: Connection timed out
Reporting-MTA: dns; vps.paskal.my
X-Postfix-Queue-ID: 8BDB3BDC46
X-Postfix-Sender: rfc822; root@paskal.my
Arrival-Date: Fri, 14 Aug 2020 02:36:26 +0000 (UTC)

Final-Recipient: rfc822; mizi@iwhost.com
Original-Recipient: rfc822;mizi@iwhost.com
Action: delayed
Status: 4.4.1
Diagnostic-Code: X-Postfix; connect to iwhost.com[103.8.24.2]:25: Connection
    timed out
Will-Retry-Until: Wed, 19 Aug 2020 02:36:26 +0000 (UTC)
Return-Path: <root@paskal.my>
Received: from [192.168.0.5] (unknown [121.122.54.45])
    (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
    (No client certificate requested)
    by vps.paskal.my (Postfix) with ESMTPSA id 8BDB3BDC46
    for <mizi@iwhost.com>; Fri, 14 Aug 2020 02:36:26 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=paskal.my; s=default;
    t=1597372586; bh=HhLK9q5QULlFvFacW/fWBx6Fd98MKgtH340pDFpadv8=;
    h=Date:From:To:Subject;
    b=ngqKYvq9aUf0Z5jhQFV+Zct1HXKjKzyjbOkLOWQfG0H33agEWQy7rA/eo9Cz4Zn5l
     1PBXqg8vAcY+OKMPfv2CPQrvmZgUJyLvFQtQkcj2RCJWLrtBDurh/WFlKJIzMiAwL+
     RqW4seoy/Q6uOBcCAL2IhRP5SBHCAw1J1sy5iYLk=
Date: Fri, 14 Aug 2020 10:36:29 +0800
From: root <root@paskal.my>
To: mizi <mizi@iwhost.com>
Message-ID: <b18836e2-41c1-482e-8e63-06815beaddc2@edison>
Subject: Testing
MIME-Version: 1.0
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By:
Paskal

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2 answers
KFSys August 15, 2020

Hi @Paskal,

It seems like your port 25 is blocked. Please make sure your port is actually allowed in your firewall configuration. To do that, you can execute the following commands on your droplet :

sudo iptables -A OUTPUT -p tcp --dport 25 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
sudo iptables -A INPUT -p tcp --sport 25 -m conntrack --ctstate ESTABLISHED -j ACCEPT

If this doesn’t help, it might be possible DigitalOcean has closed off port 25. In that case, you’ll need to contact the support directly. You can reach them by going over to the following link

https://www.digitalocean.com/support/

Regards,
KFSys

Reply Report
  • Paskal August 15, 2020

    Thanks for your suggestion. Executing that command does not work, so I proceed to submit a ticket to DO support.

    Reply Report
    • KFSys August 16, 2020

      Hi @Paskal,

      If you still haven’t received a response, can you forward your ticket ID and I’ll forward it to the support?

      Regards,
      KFSys

      Reply Report
      • Paskal August 19, 2020

        They already respond to my ticket. Apparently DO don’t like new users to send email, so I guess I’ll bring my business elsewhere.

        Reply Report
        • KFSys August 20, 2020

          HI @Paskal,

          Sorry to hear that! What I can suggest is actually still host your application/website here with DigitalOcean and host/send the e-mails of your website via a third party service. There are multiple free services which can help you with sending out e-mails via their service without it actually blocking anything on your end.

          Reply Report
dennishbhattaraiwork August 18, 2020

I too was facing the email sending problem. Once, I executed the above command my all sites faced down. Both sites are down. I too tried creating several droplets just to check email sending problem and all of them didn’t work. Incoming emails comes without any problem but outgoing doesn’t delivers.

Reply Report
  • Paskal August 19, 2020

    DO actually block port 25, in the name of “combating spams” which is quite nonsense. They should review each Droplet account instead of doing blanket ban on email sending.

    Reply Report

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