| Most likely the cause of this is from your email client being incorrectly setup for your outgoing smtp server.
Most ISPs tell their customers that they need to use the ISPs SMTP server to send email. This is true if you are sending emails that come from their domain. Example, you have internet access through Comcast, they create an email account for you called joe@comcast.com, and that account should be sent through their SMTP servers.
If you are sending emails from your own email domain account, joe@example.com, you need to be sending them through the mail servers designated to send for your example.com domain, not your ISPs mail server. The reason for this is that when another mail server receives email from joe@example.com and the email is coming from a Comcast/Yahoo/ATT/etc... mail server, it makes your legitimate email look like it is being spoofed by a spammer using the ISPs mail server to send out spam. If you correctly setup your email client so that your outgoing smtp server is your own domains smtp server, then other mail servers verify that the email came from a mail server designated to deliver mail for your domain.
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