[CentOS] Postfix relay on Comcast

[SilverTip257]

On Thu, Nov 21, 2013 at 9:08 PM, Lists <lists at benjamindsmith.com> wrote:

> How to get postfix working on CentOS 6 and Comcast. Recently, they've
> changed their policies regards email relay and require authentication
> even to send email. (they no longer use IP address ranges, presumably in
> an attempt to curb outgoing SPAM)
>

Requiring auth is how it should be.

<tangent>
Now if Comcast would provide IMAP access instead of just POP3 to
customers...
</tangent>


>
> I didn't see an updated howto anywhere on the Interwebs, thought I'd
> point out what I had to do. The part that had me stumped for longer than
> I care to admit was having to install cyrus-sasl-plain rpm - EL5
> apparently had that installed as part of the cyrus-sasl package.
>

I've seen write-ups for relaying mail through Gmail using Postfix.

Thanks for sharing.


>
> 1) yum install postfix cyrus-sasl-plain;
> # note that cyrus-sasl-plain is NOT installed by default but is needed
> by this config.
>
> 2) Create file /etc/postfix/passwords. Replace "USERNAME" with your user
> name, and
> "password" with your password. Note: your username is typically your
> email address without the domain name.
> #----------------------------
> smtp.comcast.net:587 USERNAME:password
> smtp.comcast.net USERNAME at comcast.net:password
> #----------------------------
>
> 3) makemap passwords;
>
> 4) Edit /etc/postfix/main.cf
> #----------------------------
> relayhost = [smtp.comcast.net]:587
> smtpd_sasl_auth_enable = yes
> smtp_sasl_auth_enable = yes
> smtp_sasl_password_maps = hash:/etc/postfix/passwords
> # note that with no security options on, we're using sasl-plain
> installed above.
> smtp_sasl_security_options =
> # You might need this, you may not.
> #sender_canonical_maps = regexp:/etc/postfix/sender_rewrite
> #----------------------------
>
> 5) Create file /etc/postfix/sender_rewrite. Note that not all Comcast
> customers need this, I didn't when I authenticated as above. Obviously,
> replace "USERNAME" with your user name.
> #----------------------------
> /^([^@]*)@.*$/  USERNAME at comcast.net
> #----------------------------
>
> 6) service postfix stop; sleep 5; service postfix start
>
>
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>



-- 
---~~.~~---
Mike
//  SilverTip257  //