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I cannot send email through SMTP
07-02-2012, 07:30 AM
Post: #1
I cannot send email through SMTP
I use dreamhost as my primary mail server, and I connect using a desktop client (typically Evolution). I connect to dreamhost's smtp server using authentication (port 587, TLS on, username + password).

Recently, I have no longer been able to send email, and am getting the following response from evolution:

RCPT TO <user@address.com> failed: Service unavailable; Client host [xx.xxx.xxx.xx] blocked using xbl.dnsbl; http://www.spamhaus.org/query/bl?ip=xx.xxx.xxx.xx

And this one on my iPhone (when it's on my wifi):

The recipient "user@address.com" was rejected by the server because it does not allow relaying.

This appears to be a message from dreamhost's SMTP server, not from the recipient. Unfortunately, being on a home DSL network, I have very little control over my ISP, and there is little I can do about being blocked.

I would understand this scenario if I was running the SMTP server on my home computer and the recipient blocked my message. BUT, this is not what is happening. I am authenticating with dreamhost's SMTP server, yet dreamhost's SMTP server is still refusing to allow me to send email to any recipient. This seems entirely broken!

Is there anyway to resolve this, or am I stuck only being able to send email through the webmail interface?
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07-02-2012, 01:17 PM
Post: #2
RE: I cannot send email through SMTP
Not a solution, but just wanted to add my voice to the same issue.

Been having intermittent issues with sending emails. Easiest solution for us was to restart the modem and acquire new IP which hopefully would not be blocked. But I guess the pool is not big enough.

Now I am receiving reports on errors receiving mails as well. I am going to investigate it further, but till then maybe a solution to the above problem might be helpful.
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07-03-2012, 05:06 PM
Post: #3
RE: I cannot send email through SMTP
Have you had any luck. I've been going back with dreamhost's tech support and they have not been helpful. They implemented a new policy (without telling any of us!) and no connections can be made to their SMTP server (even secure, authenticated), if that IP address is in spamhaus blacklist.

Why they'd do this I have no idea. They already require authentication to use their SMTP server. Why would they need to validate your IP address? I don't know about you, but my public IP is a shared address on DSL, so of course it's in spamhaus's blacklist, but there's nothing I can do about it!

This means that if you get on some wifi, you may or may not be able to send email through your dreamhost account. I find it really silly that even though you are authenticating, they may block you from accessing your paid for SMTP server if they don't like your IP!
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07-10-2012, 06:16 AM
Post: #4
RE: I cannot send email through SMTP
I have tracked the problem to Dreamhost using the CBL in an unauthorized manner (preventing authenticated accounts from accessing SMTP when on a blacklisted IP); excerpts from the terms and conditions of the CBL:

"Thus, by applying the CBL to your relay server for outbound email, you will be impacting legitimate email sent properly."

"In the first case (outbound email traverses the Internet to get to your relay), you MUST NOT apply the CBL to connections that do SMTP authentication (or some other technique that proves that the SMTP connection is from your customer). These will often be the NATs for wireless POPs or airport lounges or hotels. Because of this a roaming user (or us) is relatively unlikely to be able to contact the right people to get the listing fixed properly. So the user will just be very frustrated (and mad at both you and us)."

"In concrete terms: you should offer authenticated inbound email access on port 25 or port 587 (or some other port), and you MUST ignore CBL listings of connections that have authenticated. If you only allow authenticated connections on port 587 (or other non-port 25 port), you do not need to implement CBL checking on it at all."

and finally,
"If, inspite of 3, 4, 5 or 6 above you still want to use the CBL in an unsupported fashion (eg: block blog, web, IRC access, block on full received line traverse, derive other blocking heuristics, or block MSA submissions), you must take full responsibility yourself for the decision.
This means that you must remove all mention of the CBL (or Spamhaus) from any error messages or communications the user may see, and direct all support questions to your own support infrastructure."

For full terms, see #6 and #7 at http://cbl.abuseat.org/tandc.html

Tech support has been amazing evasive, but let drop that there had been certain "recent policy changes". After tracking down that they are using CBL in an unauthorized manner, I made a separate request 33 hours ago, but still no reply to that. Within the next 24 hours (unless DH relents) I'm moving out of this place.
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07-10-2012, 07:10 AM
Post: #5
RE: I cannot send email through SMTP
I'm continuing to send dreamhost support requests, and this new information really helps! So far they have completely avoided the problem! Please post back if you get anywhere with them, and I'll do the same.

Also, I have gotten this from them which they never publically announced:

*******************
We recently made a change to our mail server policy. All emails that try
to send through DreamHost's servers must not come from a computer or
server with an IP address on the SpamHaus blacklist...
*******************
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07-12-2012, 12:30 PM
Post: #6
RE: I cannot send email through SMTP
I raised a ticket 2 days ago with this problem. Spamhaus' SBL entry is clear:
Quote:Spamhaus is now escalating against Dreamhost.com due to the high amount of unresolved SBL listings. We strongly recommend Dreamhost.com makes the necessary adjustments to deal with abuse on its network in an timely fashion. If you're a Dreamhost.com customer and this SBL listing is affecting you, do not contact Spamhaus. We need to hear from Dreamhost.com about this issue.

However, their first attempt at answering was telling me that MY ISP IP address was being blocked. After I loudly answered that it is clearly THEIR server which is being blocked, they remained silent...

(07-10-2012 07:10 AM)line72 Wrote:  *******************
We recently made a change to our mail server policy. All emails that try
to send through DreamHost's servers must not come from a computer or
server with an IP address on the SpamHaus blacklist...
*******************

If this is true, Dreamhost is in the pathetic case of using an RBL to block messages which is blocking them.

Mariano Absatz - "el baby" (clueless...)
Quote:This message transmitted on 100% recycled electrons
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07-17-2012, 08:12 AM
Post: #7
RE: I cannot send email through SMTP
I too was unable to send SMTP mail yesterday. I'm using a Verizon MiFi 4G hotspot, which is apparently assigned a different IP from an internal Verizon IP range each time it connects. Apparently my first connection today involved an IP that was on two Spamhaus block lists: PBL (P=Policy) and XBL (X=Exploits); XBL includes CBL -- I learned this by using WhatIsMyIP.com to determine the hotspot's IP, then looking that up on Spamhaus.net. When I powered off/on, the next IP was only on Spamhaus PBL and my outgoing mail was no longer blocked. It's a workaround but unsatisfactory because (as others have noted) a mail host shouldn't be using CBL to filter outgoing mail.
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07-17-2012, 06:26 PM
Post: #8
RE: I cannot send email through SMTP
Hmm, there seems a fight between DH and spamhaus. What if we switch to gmail?

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07-17-2012, 07:22 PM
Post: #9
RE: I cannot send email through SMTP
If you have only a few accounts per domain, it's great. otherwise you have to pay 5$/user/month

I've bought some cheap shared hosting at justhost - fixed amount per month for unlimited email accounts, and fairly decent email sending limits (500 per hour in total), and am migrating my email there.
dreamhost has better limits (100 per hour per email address) but that's useless when the SMTP server is blocking us!
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07-26-2012, 06:05 AM
Post: #10
RE: I cannot send email through SMTP
Yup. I have been fighting with their technical support for the last 24 hours over the exact same issue. I basically cut and pasted the relevant information from Spamhaus' Terms & Conditions page demonstrating that they are in violation at which point they simply stopped communicating with me. This is customer service at its worst.
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