1and1 (1&1) Email Send Rate Limit & SMTP Restrictions
The following restrictions apply when sending emails from a web site / domain hosted by 1and1:
The following restrictions apply when sending emails from a web site / domain hosted by 1and1:
- 1and1 email send rate limit - max 99 emails at once
- 1and1 Other SMTP restrictions - each outgoing message must have less than 50Mb (including attachments)
