This is what the link for that error code says (I'd love a translation in plain English if you have one):
RL000001 :: Mail to Comcast is queued and I see RL000001 in my email logs. What does this mean?
Comcast has instituted rate limiting on all inbound email traffic. This step was taken to protect our customers and our email system from unwanted spam and malicious attacks. Any systems affected by this rate limit will receive a 4xx message (temp-fail) during the SMTP transaction. This message is designed to instruct the sending server to try again at a later time to deliver its email.
Our rate limiting policy is based on sender reputation, provided by SenderScore as well as authentication of the sending server, regardless of the number of domains from that server.
Recipients per Hour
SenderScore*
120
N/A
1,200
0 - 15
3,600
16 - 25
6,000
26 - 30
12,000
31 - 50
24,000
51 - 70
42,000
71 - 85
60,000
86 - 100
*Subject to successful authentication
If the rate-limit is impacting your ability to deliver email, shortening your server's delivery retry interval should resolve the issue.
If you require additional assistance, please contact Customer Security Assurance at 888-565-4329.
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