Wednesday, July 14, 2010

Something about YSmtp

[Note: There's an updated post on this topic]

YSmtp, and I'm sure you know who owns them. Well, they are pretty good in filtering of emails, good in the sense that they always try to park all incoming emails in your bulk folder.

With a legit email and clean server, this is what happen when you try to send an email with attachment larger than 2MB into their network, and we wonder if this is how they can offer unlimited email space since huge (if you consider 10MB as HUGE) emails are guaranteed to be dropped.

And by the way, filing this as an issue to their so-called customer care is as good as sending letter to Atlantis.

[53018] Connecting to
[53018] Connection to from succeeded
[53018] RSP: 220 ESMTP YSmtp service ready
[53018] CMD: EHLO
[53018] RSP:
[53018] RSP: 250-8BITMIME
[53018] RSP: 250-SIZE 41943040
[53018] RSP: 250 PIPELINING
[53018] CMD: MAIL SIZE=9797062
[53018] RSP: 250 sender ok
[53018] CMD: RCPT
[53018] RSP: 250 recipient ok
[53018] CMD: DATA
[53018] RSP: 354 go ahead
[53018] The smtp session has timed out.

Sometimes you would get this too:

[53018] Connecting to
[53018] Connection to from succeeded
[53018] RSP: 421 4.7.0 [GL01] Message from ( temporarily deferred - 4.16.50. Please refer to
[53018] CMD: QUIT

1) The actual IP in log was not We are using this IP to showcase the examples but feel free to do whatever you want with it. It is one of the IP that we blogged about in the bulletproof datacenter entry.
2) Email addresses in the examples are faked for safety reason. Again, you are free to do whatever you want to these addresses.
3) Whatever you do to the IP and email addresses listed in this blog entry has nothing to do with us.

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