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Spam filters with emails being sent

Telenikros
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I am working for a company in the UK and a number of our client's emails are being blocked by our customer's email accounts spam filters, looking at a number of websites for advice on Spam emails, what we are doing should not trigger the spam filters.

 

What I want to know is, can it be our email service provider that is causing the customer's email provider to block our emails?

 

So if we switch from who we are with at the moment to say Google will this fix the issue? Or will we still have the same problem?

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Posted

Do you have a proper PTR?

SPF, DKIM, DMARC?

Are you running an on premise mail server? Does it even support TLS?

Are you tring to send out marketing newsletters filled with 5MB bmp images to 10.000 customers?

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