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Blacklisted from emailing tesco.net

83dons

Casual Member
#1
Hi

I am hoping someone can help with this! Our businesss email address info@xsp.co.uk is no longer sending to any tesco.net email accounts. It returns saying "Message blocked due to spam content in the message". This doesnt make sense as I have run a blacklist test online and it says the domain is not on any major blacklists and even when we send a completely blank email it still says there is spam content! Tesco clearly has us on a list somewhere that we need to be removed from. I have tried a couple of avenues to contact Tesco but as I am not a customer they wont even speak to me! We need to know why we are being blacklisted so we can resolve this! Our website host says their server is not blacklisted and to contact the ISPs who are blocking the email address. Other similar responses we get when we email demon.co.uk and doctors.org.uk. Maybe they alll use a common blacklist or something?

Can anyone help or advise please!?

<bob.smith12345678@tesco.net>: host mx.topaz.synacor.com[69.168.108.17] said: 554
5.7.1 [P4] Message blocked due to spam content in the message. (in reply to
end of DATA command)
 

ManOfMeans

ULTIMATE Member
#2
It could be that your IP or the IP of your internet providers mail servers are on a blacklist and not you yourself, theres plenty of sites that will allow you to check this, just do a quick google.
 

83dons

Casual Member
#3
Hi have you got a good one to check. I am sure I did this and xsp.co.uk appeared in no blacklists! Which one does tesco use? I will try emailing from another PC but I think it is the email not the PC that is being blacklisted somehow.
 

83dons

Casual Member
#6
Tesco arent my ISP they are the ISP of the person receiving the email. Our email is provided by a company called Dathorn.com.

Ill check the individual IP address first but dont think its that as two different people in different locations get the same from the same email and using outlook or webmail to send to a tesco address.
 
#7
There are several possible reasons.

1/ You might be spewing spam.
2/ Someone sharing the same IP block is spewing spam and the whole block has been tagged.
3/ The IP used by your suppliers email server has been tagged for spewing spam.

I have suffered all three over the years, although the last one is usually only caused by hotmail - which is why I refuse to write to people with hotmail accounts any longer (at one point hotmail blacklisted EVERY .uk mail address!!)

First port of call should be your ISP supplier; they may also be able to tell you if the problem is 1/ or 2/
 

ManOfMeans

ULTIMATE Member
#8
There are several possible reasons.

1/ You might be spewing spam.
2/ Someone sharing the same IP block is spewing spam and the whole block has been tagged.
3/ The IP used by your suppliers email server has been tagged for spewing spam.

I have suffered all three over the years, although the last one is usually only caused by hotmail - which is why I refuse to write to people with hotmail accounts any longer (at one point hotmail blacklisted EVERY .uk mail address!!)

First port of call should be your ISP supplier; they may also be able to tell you if the problem is 1/ or 2/
Could also be a virus on their network spamming which has caused it
 

83dons

Casual Member
#9
My ISP says none of their servers are blacklisted and its not their problem. I shoul contact the ISP of the person I am trying to contact. Not sure hoe practically to narrow it down to a cause that is the main problem! Most spam checking engines say the domain isnt blocked but several different ISPs are coming back with message cant be delivered due to spam content, even when emails are blank!
 

Mark.J

Administrator
Staff member
ISPreview Team
#12
Firstly to the OP, it's best to stick to one topic instead of spreading this out over several.

But if you're not finding the sending email server IP or even your own connection IP on any email blacklists then it's most likely to be due to an anti-spam filtering system viewing your message content as spam. False positives are sadly very common with such systems and various issues could be causing it, such as the use of key-spam words like "Viagra" or including a lot of links.

Often though it's very difficult to know what is triggering a content filter as I've had some mark very plain messages as spam and yet can't for the life of me figure out why. I found this was more common when filters are set to the highest level and thus make too many assumptions and end up catching a lot of legitimate mail. The problem here is also that once an email or two has been tagged as spam by the filter then even if you change the content it may continue to be marked as a bad source.

But if this is the cause then there are a few things you can try to minimise the possibilities.. for example.

1. Write your message first in a word processor, then transfer it to a text editor (e.g. Windows Notepad) and then copy + paste it from there into your email. This strips a lot of the hidden formatting crap that word processors and email apps sometimes add, thus getting back to basics and keeping the message source clean.

2. Get rid of the http:// part from your links so they just start www. or even get rid of the www. if the website allows. This is often enough to make a filter think it's not a link because it can't be sure.

3. Take out that big professional signature at the bottom.. go back to basics with a short bit of text.

4. Take out any images or fancy HTML and send the whole message in Plain Text mode.
 
#13
Some ISPs still insist on word lists for spam detection, I have a friend who had emails bounced when she put "please help" in the title; but only some got bounced, others went through without issue.
 

83dons

Casual Member
#14
Firstly to the OP, it's best to stick to one topic instead of spreading this out over several.

But if you're not finding the sending email server IP or even your own connection IP on any email blacklists then it's most likely to be due to an anti-spam filtering system viewing your message content as spam. False positives are sadly very common with such systems and various issues could be causing it, such as the use of key-spam words like "Viagra" or including a lot of links.

Often though it's very difficult to know what is triggering a content filter as I've had some mark very plain messages as spam and yet can't for the life of me figure out why. I found this was more common when filters are set to the highest level and thus make too many assumptions and end up catching a lot of legitimate mail. The problem here is also that once an email or two has been tagged as spam by the filter then even if you change the content it may continue to be marked as a bad source.

But if this is the cause then there are a few things you can try to minimise the possibilities.. for example.

1. Write your message first in a word processor, then transfer it to a text editor (e.g. Windows Notepad) and then copy + paste it from there into your email. This strips a lot of the hidden formatting crap that word processors and email apps sometimes add, thus getting back to basics and keeping the message source clean.

2. Get rid of the http:// part from your links so they just start www. or even get rid of the www. if the website allows. This is often enough to make a filter think it's not a link because it can't be sure.

3. Take out that big professional signature at the bottom.. go back to basics with a short bit of text.

4. Take out any images or fancy HTML and send the whole message in Plain Text mode.
Thanks for this I have sent one of the emails to mailreport.co.uk hopefully the next step is they unblock the email address? I can then attempt to use some of the tips you mention above although I have no idea what the issue is - why they cant be more explicit in their return messages as to why messages are blocked then it would be easy to rectify the problem!

Why is it that some companies use this content blocking and some dont? DO tesco and demon use the same servers or something?
 
#15
Blacklisting by tesco.net solved for me

Thanks for this I have sent one of the emails to mailreport.co.uk hopefully the next step is they unblock the email address? I can then attempt to use some of the tips you mention above although I have no idea what the issue is - why they cant be more explicit in their return messages as to why messages are blocked then it would be easy to rectify the problem!

Why is it that some companies use this content blocking and some dont? DO tesco and demon use the same servers or something?
A bit late but hopefully may help someone.

My dentist trys sending me and my wife a reminder email, but they never arrive, just like their other patients who have email accounts with tesco or demon(?). The dentist has a gmail account and sends to my wife's tesco.net account which fails, so I gave him my hotmail account and all was well, as I got my wife's reminder. I tried forwarding it to her tesco account and it failed. I tried stripping out bits until I sent an email with just the dentist's web address www.xxxxxxxxxxxxx.co.uk as plain text, no subject and it failed. I put a space after each dot and the email successfully got sent and received.

I then looked up the dentist's web address using the http://mxtoolbox.com/ tool and it said the web address was on two blacklists (Blacklisted by BARRACUDA, Blacklisted by ivmSIP24).

So clearly tesco checks every web address, even if in plain text and would seem to match against a blacklist. So if you have a problem, check for any reference to a web address in the text of the email and check if that is on a blacklist. - Good luck!
 
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