Hello everyone,
my PHP email script not sending emails to some email address like

xxxx@sbcglobal.net. is there any suggestion?

Thanks
Hans

I'll assume you're sending via a locally installed mail server, in that case check /var/log/mail.log for errors.

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Yes, I have installed EXIM4 and I got the below messages at /var/log/mail.log:

1QdGNZ-0007AL-RV Message is frozen
2011-07-05 04:44:01 End queue run: pid=4319
2011-07-05 05:14:01 Start queue run: pid=5431
2011-07-05 05:14:01 1QdGNZ-0007AL-RV Message is frozen
2011-07-05 05:14:01 End queue run: pid=5431
2011-07-05 05:44:01 Start queue run: pid=6677
2011-07-05 05:44:01 1QdGNZ-0007AL-RV Message is frozen
2011-07-05 05:44:01 End queue run: pid=6677
2011-07-05 06:14:01 Start queue run: pid=7718
2011-07-05 06:14:01 1QdGNZ-0007AL-RV Message is frozen
2011-07-05 06:14:01 End queue run: pid=7718
2011-07-05 06:44:01 Start queue run: pid=7769
2011-07-05 06:44:01 1QdGNZ-0007AL-RV Unfrozen by errmsg timer
2011-07-05 06:44:02 1QdGNZ-0007AL-RV acceleratemobileapps.com [173.255.246.229] Connection refused
2011-07-05 06:44:02 1QdGNZ-0007AL-RV == suport@acceleratemobileapps.com <root@accelerate.acceleratemobileapps.com> R=dnslookup T=remote_smtp defer (111): Connection refused
2011-07-05 06:44:02 1QdGNZ-0007AL-RV ** suport@acceleratemobileapps.com <root@accelerate.acceleratemobileapps.com>: retry timeout exceeded
2011-07-05 06:44:02 1QdGNZ-0007AL-RV suport@acceleratemobileapps.com <root@accelerate.acceleratemobileapps.com>: error ignored
2011-07-05 06:44:02 1QdGNZ-0007AL-RV Completed
2011-07-05 06:44:02 End queue run: pid=7769

scbglobal.net is run by ATT.

They are very trigger happy to block anybody they consider sending spam. Not sure of how their spam rules are setup, but I wouldn't put it past users saying your mail was junk got you easily added to the list.

You can fill out the application they have for abuse issues and try to get off the list. The application assumes there was something wrong with your website that caused spam and assumes that you needed to fix something. Which is annoying when it could be the users simply not wanting your mail anymore and saying its spam (even though they registered to get the mail).