In this situation, your WP emails are plain and simple not delivered, as WordPress uses PHPmailer by default to send mail...
Depending on your email service provider, you will be able to choose between oAuth 2.0, Cram-MD5, Simple Login, or Plain Authentication.
As if something goes wrong with your email service provider or settings you can be alerted by one of your users and no-one but you can touch SMTP account's settings...
SMTP Support You'll have support for almost every FREE SMTP provider, and that includes Mailgun and SendGrid APIs..
This is caused by being logged in to Google Microsoft Yahoo with user than Mail Bank is configured to send mail with.
Ensure you're using SMTP with authentication SMTP server is the one defined by your SPF record..
If you use domain name for email, add SPF record to your DNS zone file.
SPF is specific to your provider, for example Google..
If you use domain name, add DKIM record to your DNS zone file and upload your Domain Key to, for example Google...
Mail Bank redirects you to Welcome Screen on activation, and asks you to either Skip or Opt-In for sending us information about your website..
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