Quote:
Originally Posted by gj15
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That’s a good possibility. The Fastmail SMTP server has to do several things before the SMTP transactions used to send a message begin:
- The preferred server is smtp.fastmail.com over port 465 (SSL/TLS must be activated, but not STARTTLS). The client and server must negotiate the SSL/TLS connection, but usually this is very fast.
- The client IP address must be accepted. There are block lists for known insecure IP addresses.
- If the IP looks suspicious (such as not resolving to a reverse DNS), the connection can be greylisted. This will defer the connection with a delay. The client will retry and eventually get connected.
- Authentication using an application password must be completed.
- The SMTP server reports that it is ready to accept commands. This is where the email transfer occurs.
Bill