How-to use external smtp server ?

How-to use external smtp server ? - Printable Version

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How-to use external smtp server ? - mikeb - 10-30-2008 03:53 AM

Hi all,
My ISP is blocking port 25 and I cannot use my own smtp server, it needs to be redirecting all outgoing emails towards my isp smtp server.

Thank you

RE: How-to use external smtp server - joximu - 10-30-2008 09:30 AM

Have a look in the postfix documentation...

eg. http://www.postfix.org/BASIC_CONFIGURATION_README.html#relayhost

RE: How-to use external smtp server - BeNe - 10-31-2008 04:21 AM

Or in the Wiki --> http://www.isp-control.net/documentation/howto/mail/use_a_external_smtp_server

Greez BeNe

RE: How-to use external smtp server ? - momo - 09-05-2010 12:55 AM

This works for a home laptop I use for monitoring.
It sends db backup reports and nagios alerts.
I haven't test for virtual mail.

Code:

nano /etc/postfix/main.cf

myhostname = my-isp.tld

mydomain = $myhostname

myorigin  = $myhostname

mydestination = $myhostname

relayhost = smtp.my-isp.tld

/etc/init.d/postfix restart

RE: How-to use external smtp server ? - puster - 09-07-2010 11:51 PM

Hi everybody,

is there a chance that this can be done per domain, or is this a setting which
generally only applies to an entire server?

RE: How-to use external smtp server ? - momo - 09-08-2010 12:10 AM

I doubt.

http://www.postfix.org/postconf.5.html
Search for multiple SMTP

RE: How-to use external smtp server ? - kilburn - 09-09-2010 05:13 AM

Setting otugoing mail relays for specific domains *can* be done, but it involves a great deal of postfix's custom configuration, and I'm not sure about how well this will play with ispcp's settings.

Nevertheless, what you need to do is add a new directive "sender_dependent_relayhost_maps = /etc/postfix/sender_dependent_relay". Thereafter, create the referenced file and write there something like "@domain.tld smtp:[your.provider.smtp.host]" (brackets must be there). Postmap this file and restart postfix.

By doing this, postfix will use "your.provider.smtp.host" as an outgoing relay whenever mails come from "xxxx@domain.tld" users. Additionally, you will probably also have to add these directives to main.cf:

Code:

smtp_sasl_auth_enable = yes

smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

And write the user/password combination to identify against your isp's smtp server in the "/etc/postfix/sasl_passwd" file (that must also be postmapped). It should contain something like:

Code:

[your.provider.smtp.host]    user:password

Restart postfix and it will identify as this user whenever relaying mails through your isp's smtp server.

RE: How-to use external smtp server ? - edinn - 09-15-2010 09:42 PM

is it possible to make manual entry in postfix transport map, per domain, such as :
/etc/postfix/ispcp/transport:
domain.tld smtp:mx.google.com

(postmap that file and postfix reload after)

And ofc. to remove it from /etc/postfix/ispcp/domains

I tried that today, because mx entry was overwritten by dns template after subdomain addition, but gives me relay acc. denied.

RE: How-to use external smtp server ? - kilburn - 09-15-2010 10:32 PM

@edinn: what you're doing is completely different. Namely, you are choosing the next hop transport for a given destination domain. Contrastingly, in this thread we were discussing different outgoing relays based on source address (the sender domain).

RE: How-to use external smtp server ? - edinn - 09-15-2010 11:27 PM

k, tnx, I'll start a new topic Smile