On 2013-08-01 10:13, Ian wrote:

Phil Stewart said:

 > Interestingly, I'm starting to see greylisting become less effective
 > as an anti-spam technique.

That's interesting. I'm not noticing any increase in spam getting 
through, and the logs still show an awful lot not getting past  greylisting.

There are some 'genuine' senders who don't either because their mail 
servers don't resend the mail, but these tend to be the ones who don't 
accept postmaster@ email either, sigh.

   Ian

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Just to add my recent experience to this useful thread. Yahoo seem to be the toughest, I currently have an old domain with correct PTR records and SPF set up which simply gets dropped by Yahoo's servers. I get a warning regarding delayed delivery then a day or so later a failed delivery error.

The domains that are successfully getting through to Yahoo have DKIM set up too (although I don't think this always needs to be the case).

I have just filled out this form which I am told can help:

http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html;_ylt=An8jLP5eP8VPdGZvTxFMD6eiNCV4?from_url=&last_url=

we'll see...