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rachazen
New Participant
March 9, 2016
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Email Bounce Reasons

  • March 9, 2016
  • 1 reply
  • 1760 views

Hi All,

In investigating the emails we have that are Invalid, I discovered that some of them were not delivering not because the email address was wrong, but because there were capital letters in the email and the address was case sensitive.

Has anybody else run into this issue? Is there any way around it/a way to prevent emails from not being delivered due to issues like that?

Example:

Email we sent it to: john.smith@xyzcompany.com - BOUNCED

Email we updated it to: John.Smith@xyzcompany.com - DELIVERED!

Help would be much appreciated.

Best answer by SanfordWhiteman

There's no way to know the "correct" case of an email local-part.  That's the definition of case-sensitivity.  All you can do is ensure that all of your imports and form posts are case-preserving (don't change what is originally provided, assume it's the most deliverable form). 

The number of addresses that are case-sensitive and contain upper-case letters is small -- that is, even when a mailserver is case-sensitive modern-thinking admins would try to give users an all-lowercase form -- but it's not zero.

1 reply

SanfordWhiteman
SanfordWhitemanAccepted solution
New Participant
March 9, 2016

There's no way to know the "correct" case of an email local-part.  That's the definition of case-sensitivity.  All you can do is ensure that all of your imports and form posts are case-preserving (don't change what is originally provided, assume it's the most deliverable form). 

The number of addresses that are case-sensitive and contain upper-case letters is small -- that is, even when a mailserver is case-sensitive modern-thinking admins would try to give users an all-lowercase form -- but it's not zero.

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