WordPress MU

My welcome message is being blocked by yahoo.

The welcome message is ok with gmail.

Does anyone know what might be wrong?

thanks.

here is the postfix log:
May 1 14:34:59 vs149190 popper[23613]: (null) at ad96edeab.dsl.de.colt.net (217.110.222.171): -ERR POP EOF or I/O Error [popper.c:820]
May 1 14:35:03 vs149190 popper[23764]: Stats: kent 1 759 0 0 p54a0e16a.dip.t-dialin.net 84.160.225.106 [pop_updt.c:296]
May 1 14:37:04 vs149190 postfix/pickup[25664]: 6734A44ACAC8: uid=30 from=<wwwrun>
May 1 14:37:04 vs149190 postfix/cleanup[28379]: 6734A44ACAC8: message-id=<1ebb1b91d04986f27dd96d2ee7d7aa10@www.bigblogzoo.com>
May 1 14:37:04 vs149190 postfix/qmgr[25665]: 6734A44ACAC8: from=<wwwrun@bigblogzoo.de>, size=731, nrcpt=1 (queue active)
May 1 14:37:04 vs149190 postfix/smtp[28380]: connect to g.mx.mail.yahoo.com[209.191.88.239]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:05 vs149190 postfix/smtp[28380]: connect to f.mx.mail.yahoo.com[68.142.202.247]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:05 vs149190 postfix/smtp[28380]: connect to f.mx.mail.yahoo.com[209.191.88.247]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:05 vs149190 postfix/smtp[28380]: connect to c.mx.mail.yahoo.com[68.142.237.182]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:05 vs149190 postfix/smtp[28380]: connect to g.mx.mail.yahoo.com[206.190.53.191]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:06 vs149190 postfix/smtp[28380]: connect to a.mx.mail.yahoo.com[209.191.118.103]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:06 vs149190 postfix/smtp[28380]: connect to b.mx.mail.yahoo.com[66.196.97.250]: server refused to talk to me: 421 Message from (62.75.149.190) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html (port 25)
May 1 14:37:06 vs149190 postfix/smtp[28380]: 6734A44ACAC8: to=<kentgibson@yahoo.com>, relay=d.mx.mail.yahoo.com[216.39.53.2], delay=2, status=sent (250 ok dirdel)
May 1 14:37:06 vs149190 postfix/qmgr[25665]: 6734A44ACAC8: removed

No disrespect intended but have you read the page they're pointing you to?

yup, even sent them an email. the page is pretty unclear about what I might be doing wrong.

argh now I am noticing some more weird behaviour gmail invite letter gets through, but the confirm letter gets put into spam?!

Do a search here for the smtp plugin. You may have to use that instead of the php mailer.

thanks, that was a good tip. It passed the gmail test. I need to test on yahoo. I route through gmail smtp and it goes ok. One tiny thing, yahoo might not like, reply-to: and from: are not equal. From is my gmail address and reply-to is the user email address on the server. odd. I wonder were I can configure that.

I have set up both yahoo mail and googl email accounts to do a test run and both of my emails got through and were activated.
I am using php mailer, but I have put in in plugins and not mu plugins as I couldn't get it to work in the mu plugins.
I have used the same email address as my site admins.
I don't know if this is a security risk by placing it in the plugins, it means php mailer is in all blogs.

yahoo might not like, reply-to: and from: are not equal

I don't think that's teh cause as most mailing lists are like that. Replies (and bounces) get put into a different email box.