contact me by emal or at email?
If you need any further information, please feel free to contact me by/at (the) email.
Which is correct "by" or "at"?
Do I need to put "the" before "email"?

Question

Answer

"By" is correct, and no, you should not say "the."

"Contact me by email."  
"Contact me by phone."  
"Contact me by instant message."

We use "at" with a specific address.  "Contact me at this email address."  "Call me at the following number."  "Send it to me at my home address."

Answer

"Contact me at support @ tarta.ai" if you need to mention your email.

Answer

By email.