2 Edited to remove recommendation, which is off-topic for this site, and replaced with neutral text.
source | link

It may be because the email is seen as mass email, and has no unsubscribe button or acknowledgement of where it comes from (company name etc).

Emailers like MailChimpThird-party emailers can help your emails to be trusted more often.

It may be because the email is seen as mass email, and has no unsubscribe button or acknowledgement of where it comes from (company name etc).

Emailers like MailChimp help your emails to be trusted more often.

It may be because the email is seen as mass email, and has no unsubscribe button or acknowledgement of where it comes from (company name etc).

Third-party emailers can help your emails to be trusted more often.

1
source | link

It may be because the email is seen as mass email, and has no unsubscribe button or acknowledgement of where it comes from (company name etc).

Emailers like MailChimp help your emails to be trusted more often.