Not a Spam Filter Issue, but MX |
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ebtsup 
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Joined: 29 April 2008 Location: Ft.Worth TX Status: Offline Points: 17 |
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 Topic: Not a Spam Filter Issue, but MXPosted: 03 September 2010 at 2:37pm |
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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? |
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4104 |
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Posted: 03 September 2010 at 4:04pm |
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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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ebtsup
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Joined: 29 April 2008 Location: Ft.Worth TX Status: Offline Points: 17 |
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Posted: 03 September 2010 at 4:17pm |
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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.
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yapadu
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Joined: 12 May 2005 Status: Offline Points: 297 |
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Posted: 04 September 2010 at 4:15am |
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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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