Email Rate Limits for ISPs
Comcast Email Send & SMTP Limits
Below you can find the Comcast email send or rate limit for Comcast high speed internet customers. Please note that Comcast can also block port 25 for your connection (triggering the error message: "Error #1: Port25.Secure(SSL); no Socket Error: 10053. Error Number 0x800CC0F"), in order to prevent you (or viruses on your computer) from sending emails using your own SMTP agent:
Comcast email send limit - no more than 1000 recipients per day
Comcast other SMTP limits - max 10mb per message
Comcast email-outbound policy - Comcast Customer Service - XFINITY Help and Support
Comcast SMTP restriction expiry method - the restriction is automatically lifted 24 hours after the email send limit was reached.
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