(Dutch) advanced facilities for email:
https://www.startmail.com
https://soverin.net
https://mailfence.com
https://freedom.nl (started up)
Free Outlook app for Android mobile phone:
Just enter the email address as username plus the password.
Server settings can be set automatically.
Testing facilities:
https://internet.nl (publicly accessible testresult):
Allow IPv6 with MX mail server (s)
Secure DNS of MX mail server (s)
Validity for outbound from these mail service types:
– the server itself, or relay, with or without SRS, in MTA configuration
– SMTP mail service (common setting in a high-volume application)
– HTTP mail service (works with a library in order to communicate with the mail server)
– MX mail server (to bounce an incoming email)
Sniffer Proof of MX mail server (s)
https://mecsa.jrc.ec.europa.eu (private accessible state-of-the-art test result and explanation)
https://www.dmarctester.com (private accessible test result)
https://mail-tester.com (private accessible proven test result)
http://dkimvalidator.com
https://kitterman.com/spf/validate.html
https://toolbox.googleapps.com
Check on dmarc=fail:
– In delivered email source in webmail at your internet provider.
– DMARC with “p=quarantine” stores email in spam in case of a non-legitimate mail server.
How to open port 587 in control panel Plesk:
– Outlook with SSL on port 465 does work also with TLS on port 587;
– Removed ‘#’ from /etc/postfix/master.cf before: submission inet n – n – – smtpd and restarted Postfix: # systemctl restart postfix.service;
– Plesk also has a formfield for port 587 in mail server setup to change to yes.