karolyi/py3-validate-email
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Update README.md with FAQ

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László Károlyi 2020-04-26 19:37:42 +02:00
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@ -63,3 +63,17 @@ The update can be triggered manually::
TODOs and BUGS
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See: https://github.com/karolyi/py3-validate-email/issues
FAQ:
========
The module provides false positives:
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Some SMTP Servers (Yahoo's servers for example) are only rejecting nonexistent emails after the end of ``DATA`` command has been provided in the conversation with the server. This module only goes until the ``RCPT TO`` and says it's valid if it doesn't get rejected there, since the ``DATA`` part of the email is the email body itself. There's not much one can do with it, you have to accept false positives in the case of yahoo.com and some other providers. I'm not sure if rejecting emails after the ``DATA`` command is a valid behavior based on the SMTP RFC, but I wouldn't wonder if not.
Everything gets rejected:
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Check if you have port 25 access from your IP to the accepting server's IP. Even if you do, the server might use RBL's (spamhaus.org lists, for example), and your IP might get rejected because of being listed in one of the used lists by the email server. Your best bet is to use this module on another server that delivers emails, thus eliminating the chance of being blacklisted.
I can't check thousands of emails!
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This module is a tool; every tool can become a weapon if not used properly. In my case, I use this module to check email address validity at registration time, so not thousands at once. Doing so might make you (your IP) end up in one of the aforementioned blocklists, as providers will detect you as a possible spammer. In short, I would advise against your use case.