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Not a Spam Filter Issue, but MX

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=6872
Printed Date: 05 February 2025 at 6:46am


Topic: Not a Spam Filter Issue, but MX
Posted By: ebtsup
Subject: Not a Spam Filter Issue, but MX
Date Posted: 03 September 2010 at 2:37pm

We are using spamfilter  as our primary MX record.

We have two other MX records as well, only for backup.
SO,
  MX  spamfilter.mydomain.com   pri=10
  MX  otherfilter.mydomain.com   pri=80
  MX  last-resort.mydomain.com  pri=90
However, when the users send out email, they go through another server that is not in the MX lookup.   When we built the SPF, this 'outbound only' email server - is included.

My quetion is: would this create problems for ourselves (or sending email users) - when other spam filters do an MX lookup, and not find the sending server there?


Replies:
Posted By: LogSat
Date Posted: 03 September 2010 at 4:04pm
I'm afraid so. If you publish an SPF record, you will need to specify which SMTP servers are authorized to send email from your domain (@mydomain.com). If the users will be relaying thru one of your secondary servers listed in the MX records, they too will need to be specified in the SPF record. If not, other antispam filter will see emails from your domain being sent from an IP that is not allowed to do so by your SPF record, and will thus reject those emails.

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Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

Posted By: ebtsup
Date Posted: 03 September 2010 at 4:17pm
Right
THe outbound server IS included in the SPF framework, but is not in the MX listing, could the be a problem ?  As matter-of-fact several outbound servers are listed in the SPF, but they are not listed in the MX records; because we have the MX pointed to SpamFilter server... so I am just concerned about not being listed in the MX.

Posted By: yapadu
Date Posted: 04 September 2010 at 4:15am
The servers do not need to be listed in your MX records.  You can have 1 server listed in the MX records and all your outbound email going through different servers.  If you have say 5 servers you use for outbound email you need to specify them in your SPF records (if you publish SPF records).

The fact that they are not listed in your MX records is fine.  MX records tell where to send email, SPF records tell where mail is sent from.


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I am a user of SF, not an employee. Use any advice offered at your own risk.


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