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Does the from address have to exist when sending an email?

Having issues with people receiving my emails when sending from code, and the only thing I can think of that is different is that the from email address does not exist.

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3 Answers 3

No it doesn't, there's lots of reasons why the main may not get delivered. Jeff Attwood has a good article that spells out a lot of the things to look at sending mail through code.

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The from address doesn't have to exist but note that if the sender's domain doesn't exist the message is far more likely to be flagged as spam.

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I think it has to exist but doesn't have to be accurate.

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Huh? How can it exist and not be accurate? There's no fuzzy logic in email delivery. It either exists or it doesn't. –  John Gardeniers May 12 '10 at 4:46

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