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My company briefly like this

I have 1500 IP addresses SMTP source and Exchange 2016 (Behind KEMP LB) Due to LB topology, my anonymous SMTP relay receive connector scopes store on Exchange server. Now I can control anon. SMTP relay traffic by using DNS (stmp.company.com) But, due to availability concerns and redundancy I want to move this IP address to OpentSMTPd server. My idea, all SMTP mail sources send mails to opensmptd server and opensmtpd server relays those mail to Exchange 2016 server.

When I try to configure smtpd.conf file;

  • I can create rule for from any domain to specific domain:
accept from any for domain "syt314.yasarsap.grp" relay via smtp://smtp.company.com:25
  • But I can1t create rule about from a table to any domain by using "relay via"

table sourceaddr file:/etc/opensmtpd/sourceaddr

accept from source <sourceaddr> for domain any relay via smtp://smtp.company.com:25

Is there any way to do this?

Tevfik Ceydeliler
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  • Sending mail is a difficult business, you need proper DNS PTR records to do things right, why not use services created for this? – NiKiZe Aug 17 '21 at 11:46
  • I have Load balancer and exchange-LB couple is not work preperly in my opinion. I have to move all 1500 address to LB access list. But i causes CPU problem on LB. – Tevfik Ceydeliler Aug 17 '21 at 11:59
  • Additionally, smtp://exchangeserver.company.grp:25 my inner domain server – Tevfik Ceydeliler Aug 17 '21 at 13:44
  • please update this ugly question with more context and how big is your client base in case of 1.5k servers? – djdomi Aug 17 '21 at 16:58

1 Answers1

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accept from source <sourceaddr> for any relay via

solves my problem I think

Tevfik Ceydeliler
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