1 Topic by pawawat

  • pawawat
  • Member
  • Offline
  • Registered: 2015-07-16
  • Posts: 11

Topic: How could I solve spam from null sender

I usually get spam email sent from <> sender which can't be block by blacklist

How could I solve this problem?

Thanks

----

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
  • Offline
  • Registered: 2009-05-06
  • Posts: 30,770

Re: How could I solve spam from null sender

Please always show us basic info of your iRedMail server, so that we can give you more accurate answer:

==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====

Null sender is a legit sender address, so it's hard to block, i suggest you enable postscreen (or DNSBL) and greylisting to help fight spam.

3 Reply by pawawat

  • pawawat
  • Member
  • Offline
  • Registered: 2015-07-16
  • Posts: 11

Re: How could I solve spam from null sender

How could I enable graylisting

4 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
  • iRedMail Developers
  • Offline
  • Registered: 2009-05-06
  • Posts: 30,770

Re: How could I solve spam from null sender

Please show us basic info of your iRedMail server, so that we can give you more accurate answer:

==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====

Some Linux distributions don't have package Cluebringer, so no greylisting enabled by default. See, that's why we ask you to show us basic info of your iRedMail server.

Before you show us info of your iRedMail server, you can check out our documents for postscreen and DNSBL:
http://www.iredmail.org/docs/enable.postscreen.html
http://www.iredmail.org/docs/enable.dnsbl.html

5 Reply by pawawat

  • pawawat
  • Member
  • Offline
  • Registered: 2015-07-16
  • Posts: 11

Re: How could I solve spam from null sender

My Server Info is

iRedMail version: 0.9.2
CentOS release 6.7 (Final)
LDAP
Apache
Iredadmin-proldap

6 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
  • iRedMail Developers
  • Offline
  • Registered: 2009-05-06
  • Posts: 30,770

Re: How could I solve spam from null sender

Greylisting is enabled by default on CentOS 6, in iRedMail-0.9.2. Did you see any 'greylisting' log in /var/log/maillog? Try this:

# grep 'greylisting' /var/log/maillog

7 Reply by pawawat

  • pawawat
  • Member
  • Offline
  • Registered: 2015-07-16
  • Posts: 11

Re: How could I solve spam from null sender

yes, I saw it, thanks