After doing some Googling I wonder if this Gmail error really means “Oh nothing happened, this error means that there was no error”. Humor aside here’s the error message I got twice, once while while trying to forward and once while trying to reply to the same email:
Oops… a server error occurred and your email was not sent. (#103)
The Gmail’s blog’s We feel your pain, and we’re sorry post point to resources for Gmail problems:
In the end I had 2 answers for my #103 Gmail error:
- According to a user in a Google groups post dated August 8th of this year (2008), you should check your Sent Mail. When I did the emails I was trying to send were actually there, evidently sent despite the error message
- The Gmail Help Center suggested I try a) logging in at https://mail.google.com while they were looking at the issue or possibly b) using “old” style Basic HTML Gmail if the problem persisted.
For me 1 and 2a worked, and I didn’t have to resort to using old Basic HTML Gmail.