Milter-greylist

Hi,

in a lot of cases I get temp fails from yahoo's servers and mails sent 
to this list are delayed for hours, because their servers are too busy:

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Dec 12 20:27:19 lillith sm-mta[3090]: uBCHB0HJ020512: 
to=<milter-greylist@yahoogroups.com>, delay=02:16:17, xdelay=00:00:01, 
mailer=esmtp, pri=2191280, relay=fo-mx-groups.mail.am0.yahoodns.net. 
[66.218.74.235], dsn=4.0.0, stat=Deferred: 451 Resources temporarily not 
available - Please try again later [#4.16.5].
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see: https://sg.help.yahoo.com/kb/xx-smtp-error-codes-sln26151.html

Another grotesque point for a discussion list about greylisting is, that 
yahoo's common pool servers have to be whitelisted, because they don't 
retry. Is that a place to be?

A plan could be to move to another service. Subscribed users would be 
migrated (btw: who is the list owner?). Emmanuel Dreyfus asked me to 
post this plan to the list and call for opposition.

Any suggestions for another service, e.g. google mailing lists?

Ciao
Marcus