Avoid spam filters for legitimate mail
Duplicate How are you sure that the email you send programmatically is not automatically marked as spam?
I originally planned to send emails from my site as html (i.e. content-type: text / html;), but I just thought of something today, wouldn't it be better to send emails as plain text i.e. like content: text / plain; so there is less chance of my mails ending up in the spam / junk folder, I thought it should be one rule used by spam filters for popular email services like gmail. yahoo and hotmail, what do you think?
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In my experience, most antispam systems will rate HTML Hamminess slightly below plaintext, but there are much more important things that can affect performance:
- make sure you have valid reverse DNS configuration for your mail server or you will be out of reach for many domains.
- examining adding an SPF record to your DNS zone file. It helps, especially with GMail.
- Have a look at DomainKeys if available on your platform. This is essentially a cryptographic signature attached to your outgoing mail, so it proves that you are the one who sent it.
- Review the content of your message and make sure you are not using any words (especially in the subject line) that are obvious indicators of spam.
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I believe this is safe, apart from what Tim Holland recommended, you can always send a plain text email first greeting the person and ask them to put your domain in a secure email file. I see this happening to big companies; I receive a plain text message "Welcome, make sure email@bigcompany.com is in your secure email file."
I can't say that your plain text email won't be considered spam in the first place, but at least it's a simple first step to ensure your emails go through.
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