Developers of the Nextcloud server have included the ability to add email to the platform ... or you can switch to using SMTP (which is recommended by the developers). Here’s how to do either ...

One of the little-known freebies Gmail offers is a portable SMTP server to send mail from any network for any email address. In your email client software, under Outgoing mail, set the SMTP server ...

If the problem continues, contact your server administrator or Internet service provider (ISP). The server responded: 421 Cannot connect to SMTP ... then re-add your email account The next thing ...