Option |
Google Apps SMTP relay (recommended) |
Gmail SMTP server |
Restricted Gmail SMTP server |
FQDN of SMTP Service |
smtp-relay.gmail.com |
smtp.gmail.com |
aspmx.l.google.com |
Configuration requirements |
Port 25, 465, or 587
TLS optional.
One or more static IP addresses are required. |
Port 465 (SSL required)
Port 587 (TLS required)
Dynamic IPs allowed |
Port 25
TLS not required
Dynamic IPs allowed
Mail can only be sent to Gmail or Google Apps users |
Requires authentication |
IP address provides authentication. |
Your full Gmail or Google Apps email address required for authentication |
No. |
Bypasses anti-spam |
No. Suspicious emails may be filtered. |
No. Suspicious emails may be filtered. |
No. Suspicious emails may be filtered. |
Sending Limits |
Limits for registered Google Apps users.
A registered user cannot relay messages to more than 2,000 recipients per day.
For full SMTP relay limits please see Sending limits for the SMTP relay service. |
2000 Messages per day. See Sending limits for more detailed information. |
Per user receiving limits will apply. |
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