help: notifications sent but not arriving

[gijs]

When I post something on my forum, automatic notifications are send out, but not arriving.
They do arrive on my own pc (=also the server), but not (always?) at other recipients.

My settings:
mail type: smtp
smtp server: localhost

my server is a windows server IIS 5.1,
PHP Version 4.3.8

This is the error email that I get (by email):

Reporting-MTA: dns;server
Received-From-MTA: dns;localhost
Arrival-Date: Tue, 7 Sep 2004 01:03:02 +0200

Final-Recipient: rfc822;*****@*****.nl
Action: delayed
Status: 4.4.7
Will-Retry-Until: Thu, 9 Sep 2004 01:03:02 +0200


(at the place of the * was an emailaddress..)

[[Unknown]]

Sometimes, bulk mail filters will block notification emails.  You might want to ask the people having problems if they have checked their "Junk Mail" folders.

As well, and very importantly, if you are using SMTP - do you either have port 25 blocked from the outside or do you have a username/password set up?  If not, your server is an "open relay" freely transmitting spam for spammers.  If this is the case, you will get on a dozen blacklists in no time flat and no one will get email you send.

Delayed might mean that it can't communicate with the remote server.  Can you send email yourself with an account on the server to that domain?

-[Unknown]

[gijs]

As well, and very importantly, if you are using SMTP - do you either have port 25 blocked from the outside or do you have a username/password set up?  If not, your server is an "open relay" freely transmitting spam for spammers.  If this is the case, you will get on a dozen blacklists in no time flat and no one will get email you send.
-[Unknown]

Port 25 is closed on my firewall.

Delayed might mean that it can't communicate with the remote server.  Can you send email yourself with an account on the server to that domain?

Some email is send out (and received..) though (some of the registration messages sent out from the admin-centre), just not most of it (notifications)

[gijs]

I think it has something to do with my smtpserver settings (fully qualified domain name / DNS ). Some mail is sent out and other stays in the queue, depending on the receipient...

I got it working by changing to my ISP's SMTP outgoing mail server instead of localhost..