Maximum length of email address?

Anyone know what the maximum length of *email address* the Dolphin code can accept?  Six months ago I imported about 1500 members into a D7.0.9 site and just came across a case where an unusually long email address was not getting site generated emails (a shorter email does work). The "problem" email address was 34 characters long and looked like:

abcdefghi.abcdefg.abcdef@gmail.com

I know how to enforce a limit on the length of emails added by new members... I do *not* know how to adjust the site to allow for longer email addresses.  Anyone fix this issue on a D7.0.x site... and how?

TIA

Correct email address exists in the Profiles table for this profile?

Isn't this a part of the join form?  Would it just truncate an email address too long.  Yes, what is the email address stored?  Are you saying that the Dolphin mailer is not able to use the full email address?  Not quite sure where your problem lies.

OK, just thought of this, what is the limit on that field in the database?

Edit: checked and the email type is varchar(255)

Do you think this is an issue of the SMTP in Dolphin?  The database can hold a 34 character email address, that is not the problem.  Unless it was not properly entered when the import was done.  So the problem must lie in the SMTP in Dolphin.  Check directly in the database to see what is stored in the email field for that account.

 Yes, I checked... Ican exchange email via the 'long' email address with my Hotmail account.

I checked the Join form and there is no upper limit on the number of characters... so I set it to 255. 

I like your theory that it could be a problem with the site's SMTP... I'll do more testing.