Dear colleagues,

I find myself once again facing the issue of emails being marked as spam.

This time, I have been unable to find a solution. I am curious about how you handle this situation and how you manage to remove your projects from spam lists, as well as how they end up there in the first place.

Here are the facts:

1. The mail servers that send the emails are not listed as spam.

2. The IP address used to send the emails matches the MX record of the mail server domain.

3. The outgoing address corresponds to the mail server's address.

4. The email address from which the message is sent actually exists.

5. The domain is newly registered and has not appeared on any spam lists or blacklists.

6. Only a maximum of 10 emails have been sent from this domain, all with different content.

7. Emails are immediately marked as spam by Google and Hotmail.

8. I have registered the project on Google and installed all the necessary codes.

Unfortunately, the emails still end up in spam. This is a significant problem because the entire purpose of the project is for people to generate personal calendars and share them with their friends.

I would greatly appreciate any information or assistance regarding this matter.

Thank you in advance.

Let's start by organizing things in the DNS:

1.

$ host 109.95.208.165
165.208.95.109.in-addr.arpa returns the domain name index www.colocat.com

$ host www.colocat.com
www.colocat.com is associated with the IP address 109.95.208.164

2.

$ host 94.228.168.67
67.168.228.94.in-addr.arpa returns the domain name index mail.colocat.com .

$ host mail.colocat.com
mail.colocat.com is associated with the IP address 109.95.208.165

Another option is to include a TXT record with the value "v=spf1 +a +mx -all".

It is important to check if your mailers' IP address has a PTR record. Ideally, it should exist and match the MX record.

Take a closer look at the headers of a spam email; some mailers include information about why it was marked as spam.

In general, consider using an external and trustworthy SMTP service to avoid unnecessary complications and frustrations.