Mac Mail Security

[#1]

I've tried to link my email address to Mail on my Mac, but get a message saying mail cannot be sent securely to mail.plus.net.

There seems no point in having an insecure password. What can be done?

[#2]

mail.plus.net is the POP3 server for incoming mail, not outgoing; the latter is relay.plus.net.

However Plusnet do not provide SSL/TLS (secure) connection support for mail at the moment so passwords have to be transmitted insecurely (plain text). 

Using them outside the home environment needs to be given careful thought.

[#3]

Thank you for your prompt reply.

[#4]

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@spraxyt wrote:

mail.plus.net is the POP3 server for incoming mail, not outgoing; the latter is relay.plus.net.

However Plusnet do not provide SSL/TLS (secure) connection support for mail at the moment so passwords have to be transmitted insecurely (plain text). 

Using them outside the home environment needs to be given careful thought.

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Wow. I find it astonishing that any serious ISP does not provide encryption for email. Plain text transmission of login credentials is utterly insane.