Sending mail failure

Dear Friend

recently i’m not able to send copy of my invoice via Email getting the following message

The remote name could not be resolved: ‘my.manager.io

any idea

You are using an older version. Upgrade to the latest from https://www.manager.io which will fix your problem.

Hi. I have a gmail email id and am trying to set up my email.
I think I have all me settings correct but it’s still working -
Email address - my gmail email address
Email sending format - Plain text
host - smtp.gmail.com
port - 465
SSL yes
Smtp authentication - yes
username - my gmail email id
password - my gmail password

When I test the settings it says - Message not sent.

Please help!

Use port 587. 465 is not supported.

Thanks!
Changed the port to 587. Bur now the following error is showing -

534-5.7.14 Please log in via your web browser and 534-5.7.14 then try again. 534-5.7.14 Learn more at 534 5.7.14 https://support.google.com/mail/answer/78754 v15sm1421682pfk.99 - gsmtp

What does this mean?

I think gmail now has a two-step login procedure. Search this forum for that topic. It has been discussed before. I don’t know whether there is a way to make it work, as I don’t use it. And did you follow the link provided by your mail program to learn about it?