Currently using IMAP configuration without SSL. Sending and receiving e-mail is working fine except when I’m trying to send an e-mail with any attachment (no matter the format or size). I receive the following error:
Sorry, Mailspring was unable to deliver this message. Connection error - unable to connect to the server / port you provided
- OS and Version: Windows 10 Home
- Mailspring Version: 1.6.3-134a0e55
Using own domains. Works fine on alternative software.
(Originally posted by coldpumpkin on GitHub.)