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Mail getting flagged as SPAM without reason or Solution??? 0 Recommended Answers 6 Replies 37 Upvotes
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We have Authenticated SMTP server and we have about 100+ users sending mail from it.
It has been working fine for quite a couple of years now, however for the last couple of months users have been complaining that their mail is getting flagged as SPAM and Gmail's side only shows that it is marked as SPAM but no reason is given, we have tried everything in the Bulk senders guideline but nothing has worked we have added SPF and DKIM to no avail.
We have also have checked senderscore.org and similar sites and the score has always been 90+ out of 100 Thus I can not find any solution to this and there are NO actual solutions out there thus I would PLEASE like to know how to resolve this as I have found similar questions being asked but google is not giving any real solutions to a problem that is seemingly on their side.

Anyone have any feedback regarding this ?
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Ahme Stadler
If your domain is a G Suite/Google Apps account, the domain administrator usually has access to  24/7/365 support from Google - see this page.   Non G Suite users, or users of free consumer "@gmail.com" accounts, cannot be helped by using that link. 
G Suite accounts can also use https://toolbox.googleapps.com/apps/checkmx/, and the helpful links there.
Otherwise, if some, all, or most of your emails to Gmail accounts are being classified as Spam, or being sent to Trash/Bin at the Gmail end, or Google are blocking your domain, or Google give a warning to the recipient, or if in some cases your mail is delayed before reaching Google at the last hop, or if (again in some cases) your mail is delayed internally at Google, you will need to comply with the Bulk Sender's Guidelines  at https://support.google.com/mail/answer/81126?hl=en&vid=1-635789122382665739-3305764358  (Note:  this page is badly named, it applies to ALL domains sending to GMail and G Suite accounts.)
In particular, pay attention to:-
(these above links in blue are "clickable")
Changes to MX records may take up to 72 hours to filter through the Internet.
Also check your TLS  https://www.checktls.com/TestReceiver  Google require at least TLSv1.2
Sometimes, but not always, removing links from any signature can help.  
Any URL's in the body of the mail which lead to insecure sites may also need to be removed.   Use   https://transparencyreport.google.com/safe-browsing/search to validate these links..  All links should be correctly prefixed with "https".  https://en.wikipedia.org/wiki/HTTPS   Google seem to be rejecting "http".
If the issue is with forwarded mail, you need to study  
Another possibly helpful link https://glockapps.com/blog/remove-ip-address-gmail-blacklist/ Also https://www.rackaid.com/blog/gmail-blacklist-removal/ YMMV.
If you are receiving a message "this message is not RFC 5322 compliant:", then you need to read, and comply with https://support.google.com/mail/?p=RfcMessageNonCompliant
Gmail give the recipients (if a Gmail account) a banner message as to why the mail is in Spam, if applicable.   You need to get the Gmail banner message from a recipient.  This message may have important clues for you.  Your mails will need to be marked by recipients as "Not Spam";  this is not an instantaneous solution, and may take some time for Google to acknowledge,  No way to speed this up.
Please also check your emails (both body and signature) for spammy content e.g. lots of exclamation marks; "must read"; attention getting, large and/or gaudy coloured text; text the same colour as the background; tiny text; [almost] zero height images; links hidden under text, images or links with a different URL; etc.  All or any of these may mark you as a spammer by Google.  Removal of links in signatures may also help.  Removable of clickable logos/pics in signatures may again be helpful.
If your IP is marked as a Spam Hoster, you will also need to clean this up with your service provider.  Google maintain their own lists, but this posting certainly cannot help you.  Removal from a spam hosting list can take up to four weeks to filter through.  Even after that, Google may treat you account very cautiously, until proven as non spammer.
http://goo.gl/FQXdHx is helpful for bulk email senders and marketers. And this link https://www.unlocktheinbox.com/resources/emailauthenticationcan be very useful as well.
If your domain previously had a bad reputation, and the problems hopefully have now been corrected, Google may treat your mail with caution for some time, until your credentials are established to their satisfaction.
And, as a matter of interest https://support.google.com/mail/answer/1366858?hl=en helps recipients understand why mail is flagged as Spam by Gmail.  Also see https://www.whatcounts.com/2012/03/gmail-spam-warnings-and-their-meanings-for-email-marketers/
After doing all this, and the problems persist, you can use  https://support.google.com/mail/contact/msgdelivery All errors need to be corrected, before doing this.  Google may, or may not, reply.
mxtoolbox has some good paid services available to help with your email delivery.  www.mxtoolbox.com
Finally, as we can only give general advice (unless your domain is a G Suite account), you may need to seek further help, if necessary, from your domain hoster, or employ the services of an IT contractor.
Repeating - G Suite accounts generally (if qualified) have 24/7/365 support for the domain administrator - see this page.  Non G Suite users, nor users of free consumer "@gmail.com" accounts, will not be helped in this link.
Any 'phone numbers you find on the Internet, or posting here,  pretending to be Google support, are scammers. They cannot help, may hack you, and/or install ransomware.  https://support.google.com/faqs/answer/2952493?hl=en

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Please read my original Post as we have already tried this and it did not fix/resolve the issue???
Please provide alternate solutions to the problem as it is not as straight forward as just following the senders guideline.

Looking forward to your response.
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Nothing else to offer, sorry!
You need to carefully work through that.
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We have also been having issues with our messages being sent spam.  
We have narrowed it down to just being those who use windstream.net and dejazzd.com for their email provider.
Unfortunately, that does not help us as we need to send these customers invoicing information. 

Have there been added security measures as of recently to those two internet providers that would flag most incoming email as spam?
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Are you a G Suite user?
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Emails from my server from domain "funexplosive.cz" are rejected by Gmail with message "Our system has detected that this message is 550-5.7.1 likely unsolicited mail." .
I check all points, which are mentioned above ... we are using SPF, DKIM, DMARC, we are not listed in any DNSBL spam list,   we are using TLS and so on. I found no problem. I sent to gmail support at least 5 messages already.
This problem has been going on two months already, I have no answer from google support. :-(
I have suspicious, that gmail wants to take over customers of smaller providers - I have no other explanation, why google does not answer and does not solve the problem ...
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