OtherPilot sends email to SomePilot
SomePilot replies to email, email system auto-populates reply address as otherpilot
OtherPilot does not consistently receive emails.
Sometimes OtherPilot is often told that somepilot is offline, and sometimes SomePilot is told that OtherPilot is offline, while both pilots are actually online. Other times, the email may or may not be delivered, but typically the pilot needs to relog before they have visibility of any new emails.
Also: notice the above changes in name capitalization.