1 Topic by kulmacet (edited by kulmacet 2021-05-27 00:19:25)

  • kulmacet
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  • Registered: 2015-11-04
  • Posts: 4

Topic: Getting a HELO alert

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version 0.9.9 MARIADB edition.
- Deployed with iRedMail Downloadable installer?
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (MySQL):
- Web server (Nginx):
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

When trying to send message to a specific domain receiving this alert:

May 26 05:41:08 <MY_MAIL_SERVER> postfix/smtp[28766]: 4Fqmjn1Qm5z9xrCX: to=<EMAIL@THEIRDOMAIN.COM>, relay=<THEIRDOMAIN.COM>.hosted_service.com[Obfufscated IP address]:25, delay=2263, delays=2263/0.01/0.24/0, dsn=4.4.2, status=deferred (lost connection with <THEIRDOMAIN.COM>.hosted_service.com[Obfufscated IP address] while performing the HELO handshake)

Not sure how to troubleshoot?
Any comments or support appreciated.

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
  • iRedMail Developers
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  • Registered: 2009-05-06
  • Posts: 30,787

Re: Getting a HELO alert

Probably a temporary network issue, or recipient server configuration problem, or recipient server blacklists your server in some way.