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An other mystery to solve: according to the program I use it is not possible to check addresses for german provider t-online. Anyone have a clue how to validate their addresses?
Also, is the '550 Requested action not taken: mailbox unavailable' from hotmail similar to a 'user unknown' or something temporary?
All help on resolving the above issues is very much appreciated.
Thanks in advance.
It took a while to get everyone re-signed up over on the new list, but it helped give us a clean start/foundation to move forward with...
With a small mailing list I did this manually but I never tried to analyse the returns. I just kept a record, anything that failed on two successive mailouts was zapped.
Send out a feeler e-mail/newsletter to the list. Ask folks to re-register under a new list.
Anyway, for the moment I am stuck with the software I have at hand and need to clean the DB so I a) don't send too many (I pay for the program on a per email basis) and b) don't trigger any blacklist or whatever to block my future mailings.
Thanks to both of you for your quick and helpful replies.
4XX and 4.x.x error are transient failures relating the the receiving mail-server's load factor. Retrying is valid.
Yahoo and MSN/Live give out 5XX/5.x.x errors when the user has been inactive but the mailbox is still present. Typical Yahoo error: "Remote host said: 554 delivery error: dd Sorry your message to #*$!#*$!email@example.com cannot be delivered. This account has been disabled or discontinued [#102]. - mta205.mail.re3.yahoo.com"
A true Yahoo! 5XX/5.x.x error is: "This user doesn't have a yahoo.com account"
[edited by: phranque at 7:15 am (utc) on Oct. 6, 2009]