OSX/postfix: Unable to send mail with PHP mail() [closed]

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Some while ago I've installed XAMPP on my Mac OSX machine. Without ever doing relative configuration myself, the PHP mail() function worked beautifully.

Since a few weeks, without any apparent changes, it stopped working.

It worked both with my own ISP and with one of my clients' ISP. Now it doesn't work with either so I suspect it's a local problem. Also, the mail does make it to postfix, so I suspect this is not a XAMPP/PHP issue.

Does anyone have experience with this?

Recent postfix mail.log

Jul 11 10:20:57 MyMac postfix/master[9012]: daemon started -- version 2.5.5, configuration /etc/postfix
Jul 11 10:20:57 MyMac postfix/qmgr[9014]: 3D6271033872: from=<nobody@MyMac.local>, size=3061, nrcpt=1 (queue active)
Jul 11 10:20:57 MyMac postfix/qmgr[9014]: 6083B1033897: from=<nobody@MyMac.local>, size=3061, nrcpt=1 (queue active)
Jul 11 10:20:57 MyMac postfix/qmgr[9014]: 765E210338C9: from=<nobody@MyMac.local>, size=3061, nrcpt=1 (queue active)
Jul 11 10:20:57 MyMac postfix/qmgr[9014]: D981E1033892: from=<nobody@MyMac.local>, size=3061, nrcpt=1 (queue active)
Jul 11 10:21:27 MyMac postfix/smtp[9016]: connect to ASPMX.L.GOOGLE.COM[74.125.79.27]:25: Operation timed out
Jul 11 10:21:27 MyMac postfix/smtp[9018]: connect to ASPMX.L.GOOGLE.COM[74.125.79.27]:25: Operation timed out
Jul 11 10:21:27 MyMac postfix/smtp[9019]: connect to ASPMX.L.GOOGLE.COM[74.125.79.27]:25: Operation timed out
Jul 11 10:21:27 MyMac postfix/smtp[9017]: connect to ASPMX.L.GOOGLE.COM[74.125.79.27]:25: Operation timed out
Jul 11 10:21:57 MyMac postfix/smtp[9016]: connect to ALT1.ASPMX.L.GOOGLE.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:21:57 MyMac postfix/smtp[9018]: connect to ALT1.ASPMX.L.GOOGLE.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:21:57 MyMac postfix/smtp[9017]: connect to ALT2.ASPMX.L.GOOGLE.COM[74.125.45.27]:25: Operation timed out
Jul 11 10:21:57 MyMac postfix/smtp[9019]: connect to ALT1.ASPMX.L.GOOGLE.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:22:27 MyMac postfix/smtp[9016]: connect to ALT2.ASPMX.L.GOOGLE.COM[74.125.45.27]:25: Operation timed out
Jul 11 10:22:27 MyMac postfix/smtp[9018]: connect to ALT2.ASPMX.L.GOOGLE.COM[74.125.45.27]:25: Operation timed out
Jul 11 10:22:27 MyMac postfix/smtp[9019]: connect to ALT2.ASPMX.L.GOOGLE.COM[74.125.45.27]:25: Operation timed out
Jul 11 10:22:27 MyMac postfix/smtp[9017]: connect to ALT1.ASPMX.L.GOOGLE.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:22:57 MyMac postfix/smtp[9016]: connect to ASPMX3.GOOGLEMAIL.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:22:57 MyMac postfix/smtp[9018]: connect to ASPMX3.GOOGLEMAIL.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:22:57 MyMac postfix/smtp[9019]: conne开发者_如何转开发ct to ASPMX2.GOOGLEMAIL.COM[74.125.43.27]:25: Operation timed out

Update; here's some log of sending mail; (address removed)

Jul 11 10:23:27 MyMac postfix/smtp[9016]: 3D6271033872: to=<email@removed>, relay=none, delay=3473, delays=3323/0.03/150/0, dsn=4.4.1, status=deferred (connect to ASPMX2.GOOGLEMAIL.COM[74.125.43.27]:25: Operation timed out)
Jul 11 10:23:27 MyMac postfix/smtp[9018]: 765E210338C9: to=<email@removed>, relay=none, delay=2683, delays=2533/0.02/150/0, dsn=4.4.1, status=deferred (connect to ASPMX5.GOOGLEMAIL.COM[74.125.157.27]:25: Operation timed out)
Jul 11 10:23:27 MyMac postfix/smtp[9019]: connect to ASPMX3.GOOGLEMAIL.COM[72.14.213.27]:25: Operation timed out
Jul 11 10:23:27 MyMac postfix/smtp[9017]: connect to ASPMX2.GOOGLEMAIL.COM[74.125.43.27]:25: Operation timed out

sending to hotmail: Here I get another message.

Jul 11 10:46:23 MyMac postfix/smtp[9069]: 355CD1033C4E: to=<address@removed>, relay=none, delay=150, delays=0.05/0.01/150/0, dsn=4.4.1, status=deferred (connect to mx3.hotmail.com[65.55.37.72]:25: Operation timed out)
Jul 11 10:49:42 MyMac postfix/master[9081]: fatal: open lock file pid/master.pid: unable to set exclusive lock: Resource temporarily unavailable
Jul 11 10:49:42 MyMac postfix/pickup[9013]: 3E90C1033CC5: uid=-2 from=<nobody>
Jul 11 10:49:42 MyMac postfix/cleanup[9082]: 3E90C1033CC5: message-id=<20110711084942.3E90C1033CC5@MyMac.local>
Jul 11 10:49:42 MyMac postfix/qmgr[9014]: 3E90C1033CC5: from=<nobody@MyMac.local>, size=3066, nrcpt=1 (queue active)
Jul 11 10:50:12 MyMac postfix/smtp[9084]: connect to mx2.hotmail.com[65.55.37.104]:25: Operation timed out
Jul 11 10:50:42 MyMac postfix/smtp[9084]: connect to mx4.hotmail.com[65.55.92.136]:25: Operation timed out

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To me looks like authentication...

I believe gmail only allow smtp relay with an authenticated account...

I had to follow this info to get it working in the past... http://herson.biz/?p=94

EDIT

IP may be blacklisted with them (and possibly other providers).