Topic: Backscatter spam and SPF Record config

[banana_boat30]

Hi,

For the last few days we've been receiving backscatter spam on few users in the company. I've checked our server configuration and run the test open relay just to make sure and everything is in correct order. We are running SME server 7.5.1.

Does anyone have any suggestion to tackle the backscatter spam?

I'm just wondering if anyone here had any experienced of configuring SPF record?

[Jáder]

I have all my servers (SME 7.5.x) with SPF configurated.

the google has lot of information about how this must be done.
The basic:
create a TXT record on DNS with something like this:

Code: [Select]

"v=spf1 a mx a:YOUR.FQDN.DOMAIN.OF.SME  include:ANY.OTHER.SMTP.SERVER.AUTHORIZATED.TO.SEND.EMAIL.LIKE.AN.ISP -all"

and replace
YOUR.FQDN.DOMAIN.OF.SME with your external FQDN . something like: mail.linuxfacil.net
and
ANY.OTHER.SMTP.SERVER.AUTHORIZATED.TO.SEND.EMAIL.LIKE.AN.ISP with another SMTP server you use to relay mail (a MailMarketing service, an ISP you use to relay, ...).

please note both text must be used in lower case not upper case!

This way, you´re saying just your SME server and the other one is able to send mail as from your domain.
You can delete "include" if it´s just your own SME server!

Good luck.

Jáder

[byte]

Or just use this:

http://www.openspf.org/

[Knuddi]

What do you mean with backscatter spam - normally this means that you accept emails only to reject these afterwards. This is not standard SME behaviour so you need to look at other mail plugins. Could be a listmanager.


With respect to SPF, then use the wizard as suggested and when you think you have done it right, send an email to check-auth@verifier.port25.com and they will send a report back.