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Re: Yahoo 461 responses.

2009-02-17 12:38:47

Paul Smith wrote:

Have you seen the error? Are you sure it's not something like:
450 4.6.1 ....

Yahoo! has a variety of SMTP reply formats:

Some of 'em may be confusing to human readers, but they all appear to be within spec.

One older practice of theirs was to have "[#4.16.x]" at the end of the human-readable portion, purely for their own internal diagnostics:

451 Resources temporarily not available - Please try again later [#4.16.5]

There's an unfinished proposal floating around MAAWG to standardize placing the internal diagnostic code at the beginning of the human-readable portion (after the extended response code), and Yahoo! has been moving in that direction already:

553 5.7.1 [BL21] Connections not accepted from IP addresses on Spamhaus PBL

I couldn't find anything for 461 or 4.6.1 or [#4.6.1] on, though.

J.D. Falk
Return Path Inc

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