can't send mail to external email addresses

[nylarosie]

Hello...managed to sort out earlier problem.

I am seemingly sending out a small campaign successfully ....records as being sent ...but in reality the mails are only going to the users in the network and not outside....any ideas?

Thanks

[kpit]

What is your configuration?

[nylarosie]

Hello,

Windows small business server 2003
Wamp V5 1.6.5

Any ideas?....the individual email does work.

Thank you

Nyla

[Angel]

Not sure I am clear on what you are saying, but are you saying that you can successfully send to an individual address that otherwise fails in a campaign?

Also, where is your SMTP server? Is it on the SBS box? Is relaying enabled?

[nylarosie]

Hi Angel,

Yes...individual emails go through email module but not via campaign..we have created bounce acc etc and have cron running.

SMPT is at out ISP not on SBS.

We don't have OUtlook Exchange running, using POP3 accs

Is the relay enabling though a service on WAMP ...or where?

Thank you very much..please tell me more!

Nyla

[roblaus]

Hi,

There might be a problem with your ISP - as Angel said - his smtp box might not relay emails. My ISP has his configured in a way that only two emails at the same time are accepted. Additionally there was/is a header problem - if somehow his program detects that there is a sender in the header that has a different domain than the one it should have (mine) then it flatly refuses to relay. E.g. it is not possible with our ISP to forward ANY email to an outside address. Don't ask me which parts of the header are responsible for it.

What you should try: Get yourself a gmail address and test it it with Google's smtp server. They won't accept large batches but it should be enough for testing puposes in order to exclude the ISP as a possible source. Be careful - Google uses TLS and port 587 instead of 25...

rgds
rl

[Angel]

One other related side note, I've had ISPs that limit the number of messages that can be sent per session. Pretty low number too.

I had one where I could only send about 5 messages, then I had to disconnect and then reconnect to the SMTP server before I could send the next batch.

[baigeman]

There is an article I have been reading about Port 25 vs 587 that might identify some ISP SPAM concerns:

http://www.pcmag.com/article2/0,1759,1838667,00.asp

"The conventional way for a mail client program to send e-mail is using TCP port 25, which is also the port used by mail servers to talk to each other. But port 25 is widely abused by malware to spread worms and spam. As a result, many ISPs are restricting its use."

The article goes on to talk about why you should use port 587.

Hopefully you can send via 587 to your ISP to clear this up.

Also make sure that you pass SPF or Domain Keys email security checks.
http://www.openspf.org/

These help mail servers ensure you are originating email from the domain you claim to be from