It seems like maximum size for an email is 25 MB.
"With Gmail, you can send and receive messages up to 25 megabytes (MB) in size."
"With Gmail, you can send and receive messages up to 25 megabytes (MB) in size."
mike@alfa:~$ telnet gmail-smtp-in.l.google.com 25
Trying 209.85.143.27...
Connected to gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP z4si16632304weq.140
EHLO mail.cardwellit.com
250-mx.google.com at your service, [178.79.145.246]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250 ENHANCEDSTATUSCODES
"We'll accept up to 25MB!" And then when you send something 26 or 27MB because you don't notice that it's so close to the limit, the system forgives you.