E-mails we send keep getting blocked or going to recipients spam folders

Hello,

We have a rather strange issue which has just started happening in the last week. When we e-mail around 70% of our clients our e-mails either get blocked or go straight to the recipients spam folder. I have checked our domain and e-mail server IP on MXtoolbox and DNS stuff blacklists amongst other sites and we are not listed on. Any advice on this would be most appreciated.

Thanks
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purpleoakAsked:
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JohnBusiness Consultant (Owner)Commented:
checked our domain and e-mail server IP on MXtoolbox and DNS stuff blacklists

If all this is OK, then:

1. Your emails may be heavy on embedded graphics and then these to trigger anti spam filters.

2. Recipients ARE responsible for whitelisting your emails. Put whitelist instructions in the footer of the email so that recipients can follow up when they see your emails in their quarantine.
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rindiCommented:
Make sure your users always use a title for their mails, and that they don't use any of those common Spam words like pharmacy, drugs, etc.
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gheistCommented:
Also make sure your mail server does not use any default hostnames in HELO, like exchange.local etc.
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dsnegi_25decCommented:
I believe DNS records were created properly.

Like :- PTR, TXT etc

Check  antivirus might be that is causing the issue.
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purpleoakAuthor Commented:
it was the signature that was the issue.
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JohnBusiness Consultant (Owner)Commented:
@purpleoak  - Thanks for the update and I was happy to help.
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