If you can trust everything to go right, then gmail-to-gmail is perfectly secure. Hackers breaking into Google and accessing that email.Governments forcing Google to hand over that email.Google choosing to read that email despite their assurances to the contrary.Rogue Google employees reading that email.
This leaves them open to various threats: The receiving server stores an unencrypted copy in the recipient's Inbox. However, the sending server stores an unencrypted copy of the email in your Sent folder. Google mail servers all speak STARTTLS if possible, so for gmail-to-gmail the transmission step shouldn't be a concern. The mail messages sit unencrypted on the disk of the source, destination, and any intermediate mail servers.The SMTP network protocol is unencrypted unless STARTTLS is negotiated, which is effectively optional.Email is historically considered insecure for two reasons:
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