1 Topic by 77 (edited by 77 2017-09-22 01:38:22)

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Topic: Emails being delayed or not being recieved.

======== Required information ====
- iRedMail version (check /etc/iredmail-release): latest as of today
- Linux/BSD distribution name and version: ubuntu 16 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx): apache
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====


People are SOMETIMES unable to send us an email. Its not an attachment issue or a blacklist issue, it seems the connection with the server is being delayed or is not being established sometimes.

I received these screenshots of the error that they have recieved.

Please advise

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2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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Re: Emails being delayed or not being recieved.

The HELO hostname (symafiaedge.savola.com) used by sender server is not resolvable by DNS query. Please ask the server admin to add required A type DNS record for its HELO hostname.

As a temporary solution, you can whitelist this HELO hostname in file /etc/postfix/helo_access.pcre on your server.

3 Reply by 77

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Re: Emails being delayed or not being recieved.

Thank you so much.  How can I add it to a whitelist, can you help me with the code?

4 Reply by 77

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Re: Emails being delayed or not being recieved.

Is this the line that I add the IP addresses in the whitelist?

# bypass "[IP_ADDRESS]"
/^\[(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\]$/ DUNNO

How do I add the IP address, can you help me with the syntax.

Thank you

5 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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Re: Emails being delayed or not being recieved.

You can copy a sample line from /etc/postfix/helo_access.pcre, replace the domain name. big_smile

FYI: http://www.postfix.org/pcre_table.5.html