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SMTP server blacklisted?

tukatshak
Freshman

SMTP server blacklisted?

As of about 7 p.m. EDT this evening (08/18/18), I am not able to send any emails, as I am getting the message that the HughesNet SMTP server IP address is blacklisted.  Is this one of those things where I have to wait 24 hours?  I know that spam traffic has been terrible of late.

 

Any suggestions?  Thanks!

 

Sukie in the Hudson Valley

13 REPLIES 13
MarkJFine
Associate Professor

Re: SMTP server blacklisted?

@tukatshak

Turns out smtp.hughes.net [69.168.97.48] is listed on spam.dnsbl.sorbs.net (as is smtp.lithium.com [208.74.204.5], btw).

 

Not to be pedantic, but that shouldn't technically prevent you from sending email. Some email servers my reject receiving it, preventing the intended recipient from getting it.

 

How exactly are you getting notified of this? Bounce email from the receiving server, perhaps?

 

Edit:
@Liz

@Amanda
Note to admins. I did notice this in the headers. Probably want to have the tech folks fix the SPF in your DNS entry:

 

      Received-SPF: neutral (smtp01.hughes.cmh.synacor.com: 97.73.80.47 is neither permitted nor denied by domain of hughes.net)


Setting the SPF helps to validate email from a specific domain and might alleviate getting listed on some blacklists due to forged/stolen senders coming from other email servers.

 

Edit2:
To do this, add a TXT record to the DNS entry that says something like:

v=spf1 a mx ip4:97.73.80.47 -all

The IP was taken from above, but it might have to be duplicated for the various servers used by Synacor (e.g., if there's a smtp02, smtp03, etc.).


* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
MarkJFine
Associate Professor

Re: SMTP server blacklisted?

Did manage to check the SPF record using a third party tester that I use for my own domain(s).

 

Seems the record is there (and includes quite a range of allowable IPs) but is terminated by a '?'. That's what's causing the neutral response. If the '?' is changed to a '-all' it will cause the forged emails to fail.

 

You can also add a TXT record to implement DMARC reporting of successful/failed emails based on SPF and DKIM (if that's also implemented - doesn't look like it though).


* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
Brooke
Alum

Re: SMTP server blacklisted?

Hello tukatshak, apologies on the delayed response. Is this issue still ongoing for anyone?

 

-Brooke

MarkJFine
Associate Professor

Re: SMTP server blacklisted?


@Brooke wrote:

Hello tukatshak, apologies on the delayed response. Is this issue still ongoing for anyone?


smtp01.hughes.cmh.synacor.com is currently listed on:

cbl.abuseat.org
pbl.spamhaus.org
xbl.spamhaus.org
zen.spamhaus.org
 
smtp.hughes.net is currently listed on:
dnsbl-1.uceprotect.net
spam.dnsbl.sorbs.net
https://bgp.he.net/ip/69.168.97.48#_rbl
 
smtp.lithium.com is currently listed on:
spam.dnsbl.sorbs.net
 
#ugh

* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
tukatshak
Freshman

Re: SMTP server blacklisted?

Dear Brooke,

 

Wow.  9 days to get a response?

 

My issue lasted at least 24 hours.  During this time, both native WebMail, and my popped Outlook account were completely hosed.  Then things righted themselves.  I have no way of knowing what happened in the background.

 

MarkJFine, bless his heart, has been trying to report all the places where HughesNet is blocked or reported on spam lists.  I hope someone at HughesNet will now look into this. 

 

Thank you for inquiring.  Now, if HughesNet would just stop all the spammers from using our addresses to produce spam....so we don't get on the bad lists....

 

MarkJFine
Associate Professor

Re: SMTP server blacklisted?


@tukatshak wrote:

Now, if HughesNet would just stop all the spammers from using our addresses to produce spam....so we don't get on the bad lists....


Pretty sure changing that softfail '?' to hardfail '-all' in the DNS SPF record might help to do that as long as all three smtp IPs I mentioned as well as 'a' and 'mx' are included.

 

Might be advantageous to employ DKIM if possible, but that may not be practical.


* Disclaimer: I am a HughesNet customer and not a HughesNet employee. All of my comments are my own and do not necessarily represent HughesNet in any way.
maratsade
Distinguished Professor III

Re: SMTP server blacklisted?

"9 days to get a response?"

 

It takes as long as it takes -- there may not be a fast fix for this. And if they applied a fast fix and it didn't work, you'd be here ranting about how the fix didn't work.  Try to be patient. 

GabeU
Distinguished Professor IV

Re: SMTP server blacklisted?


@tukatshak wrote:

Dear Brooke,

 

Wow.  9 days to get a response? 


This is the General Discussion section.  It's not meant for support, which is clearly stated in the section description.  

 

If you have a future technical issue with which you would like help from a HughesNet representative I suggest posting in the Tech Support section to get that help.


Ryzen 5 3400G | MSI B450M Pro-M2 MAX | 16GB Corsair Vengeance DDR4 3000 | XPG SX8200 Pro 512GB NVMe | Windows 10 Pro
tukatshak
Freshman

Re: SMTP server blacklisted?

I am sorry I made a mistake.  The heading to “Tech Support” says “Tips and Tricks”, and I did not need a tip or trick.  I needed immediate help.  I thought someone in the community might be able to help.  Again, I thank MarkJFine, who is far more technical that I could ever be for trying to point out that settings having nothing to do with my personal account might be changed to help a lot of people.

 

My apologies, again. Perhaps someone could have pointed me in the right direction a little earlier....