I recently purchased an iPhone 11 and since setting it up my Mac (2015 vintage but upgraded from El Capitan to Monterey) will no longer connect with IMAP SMTP servers for Mail. I've changed Apple ID passwords and restarted the Mac but nothing doing. My other Mac's Mail is working fine as is the case for my new iPhone and iPad. Any ideas anyone?
iMac 21.5″, macOS 12.6
Is the problem strictly on your phone, or is it on your Mac? If only on your phone, the iPhone forum may be able to help you better.
Using iPhone - Apple Community
IMAP and SMTP are protocols used for most emails except those associated with Microsoft accounts. If they are not given the right server, port, or authentication settings they can get messed up. Apple's prepopulated account types in creating mail accounts are hit and miss, except for the iCloud account. Be sure to get the correct settings from whomever your email account provider is.
IMAP SMTP login failure
