a) Your emails are always correctly sent and delivered with the best available email technology (Gmail)
b) Mailtrack just adds a tracking pixel to your emails, but doesn't send your emails. Adding a tracking pixel to your emails shouldn't cause any problem at all.
c) In case your emails are not received or classified as spam, it means that the recipient email service (email server, firewall or antivirus) made a false positive. This means that the recipient email service believes your email is dangerous or spam.
Some reasons for a false positive:
- The recipient's spam filter rules are too strict or poorly configured.
- Your sender email is blacklisted as a spammer by the recipient's spam filter.
- Your email provider server is blacklisted by the recipient's spam filter.
- The subject/text of the email is marked as spam by the spam filter. This may be because the email contains words that the spam filter does not like, you aded links to a domain with a bad reputation, etc.
Please keep in mind that it is impossible to know the exact reason why a spam filter identifies your email as spam. Spam filters never explain their policies because they do not want to help spammers. We recommend the free website mail-tester.com, which can help you find out why your emails do not end up in the inbox.