Unsent e mails
I Can receive e mails, but am unable to forward on or send e mail.
iPad, iOS 9.3.5
Not sure how this issue would relate to one of the Apple routers......the AirPort Express, AirPort Extreme or AirPort Time Capsule......shown below:
Can you please provide more information about why you feel that the AirPort router might be the issue? If you can receive emails, then you know that the Internet connection is working......and the issue is more likely related to email settings or a possible firewall that is being used by your provider.