with a SMTP server down, will SMTP callout reject new mail?

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meister
Posts: 29
Joined: Mon Nov 06, 2006 8:27 pm

with a SMTP server down, will SMTP callout reject new mail?

Postby meister » Wed Jan 17, 2007 5:14 pm

If the mailserver is down, and I have SMTP callout enabled, will MC reject new mail since it can't verify that the recipient exists.

Or does it only reject mail when it gets a "user unknown" message from the server?
the_fbi
Posts: 49
Joined: Sat Dec 09, 2006 11:28 am
Location: Oxfordshire, UK

Postby the_fbi » Wed Jan 17, 2007 7:02 pm

I don't know about SMTP callout, but Active Directory callout caches results so even if the AD server is down, if its had an email to that address before it doesn't need to check again.

As per this message.
"Previous (cached) callout verification failure"

No idea of cache lifetimes though....
olivier
Posts: 1348
Joined: Thu Jan 01, 1970 1:00 am
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Postby olivier » Wed Jan 17, 2007 9:26 pm

SMTP callout: caches the results (negative for 2h, positives for 24h), if callout server is down and recipient address is not in cache, the message is accepted.

LDAP callout: no cache ! if callout server is down, the message is also accepted.
the_fbi
Posts: 49
Joined: Sat Dec 09, 2006 11:28 am
Location: Oxfordshire, UK

Postby the_fbi » Wed Jan 17, 2007 9:53 pm

olivier wrote:LDAP callout: no cache ! if callout server is down, the message is also accepted.

Since my previous response I've since found that I've configured ours for SMTP callout, but LDAP user authentication by mistake (one tickbox wrong).

Should I presume that LDAP is faster/more efficient, or is SMTP callout better?
olivier
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Joined: Thu Jan 01, 1970 1:00 am
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Postby olivier » Wed Jan 17, 2007 10:00 pm

SMTP callout is really more efficient.
First the smtp dialogue insert less overhead that a full ldap query (maybe with authentication, etc..), and second, the smtp callout cache can dramatically reduce the queries.

LDAP callout is to be used only whem SMTP callout cannot be used.
the_fbi
Posts: 49
Joined: Sat Dec 09, 2006 11:28 am
Location: Oxfordshire, UK

Postby the_fbi » Wed Jan 17, 2007 10:09 pm

olivier wrote:LDAP callout is to be used only whem SMTP callout cannot be used.

In which case I'd mistakenly done it correct!

Thanks for the clarification.
meister
Posts: 29
Joined: Mon Nov 06, 2006 8:27 pm

Postby meister » Thu Jan 18, 2007 2:15 pm

Thanks again Olivier.

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