This was for the episode "The Dad Who Knew Too Little". Needless to say, after the episode aired, when he logged into the email, the inbox already reached its 999-email limit.
To borrow from Wikipedia:
*At first, Selman answered the messages individually, trying to come up with clever responses for each one. He then ran out of ideas and his answers started getting less clever, and eventually he would just copy a few responses and use them on all the messages.*
Sounds like the show's run to me.
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