First, our tool resolve host name (SMTP server) to IP address from Email that you are checking and then try to connect to that SMTP server via port 25 (it is standart Simple Mail Transfer Protocol port for sending mails). For example [email protected] point to Email SMTP server mx4.hotmail.com with IP address 65.55.37.120. If connection is
How to Use Google SMTP — A Complete Tutorial for Beginners Jun 17, 2020 How do I find my SMTP server address for GMail? Nov 25, 2019 How To Use Google's SMTP Server | DigitalOcean
How to Remove Your IP Address from Gmail’s Blacklist
Email from Any Email Address Based on IP Address. The Office 365 Exchange Server can be configured to allow SMTP Relay for specific IP addresses. This eliminates the need for a specific user name and password login. For a fixed location like an office or web site, a specific IP address or set of IP addresses can be allowed to use the SMTP server.
Sep 22, 2017
dns - How do I allow all possible IPs for Gmail servers $ host smtp.gmail.com smtp.gmail.com is an alias for gmail-smtp-msa.l.google.com. gmail-smtp-msa.l.google.com has address 74.125.127.108 gmail-smtp-msa.l.google.com has address 74.125.127.109 But these two also probably keep changing, based on your question. So it's best to whitelist the entire netblock -- use whois with the IP: Setup internal SMTP relay server to user Google mail