Worried about Spam? Leave all your worries behind with FlockMail!!
FlockMail uses various filters to keep your inbox clean. Let's see what all do we use in order to test if a mail is spam or not:
- Postscreen
- This is a service we use which helps us detect if an incoming email is from a spambot or if it contains malware. If the email fails this check then it is rejected.
- This is a service we use which helps us detect if an incoming email is from a spambot or if it contains malware. If the email fails this check then it is rejected.
- Sender Check
- This component detects if the received email has been sent by a valid email server. Sender Check will essentially perform a reverse DNS lookup to figure out what is the IP of the received email. If the IP does not point to a valid mail server, the mail will be rejected.
- This component detects if the received email has been sent by a valid email server. Sender Check will essentially perform a reverse DNS lookup to figure out what is the IP of the received email. If the IP does not point to a valid mail server, the mail will be rejected.
- SPF Check
- This will check the SPF record of the sender domain and validate whether the email is coming from a valid server mentioned in the SPF record . If the mail is received from an unauthenticated source, SPF check will perform the action mentioned in the sender domain’s TXT record:
- HardFail: Mail will be rejected if it is received from an unauthenticated source
- SoftFail: Mail will be accepted but will tag it as ‘suspicious’ and warn the recipient
- This will check the SPF record of the sender domain and validate whether the email is coming from a valid server mentioned in the SPF record . If the mail is received from an unauthenticated source, SPF check will perform the action mentioned in the sender domain’s TXT record:
- RBL Check
- The IP address of the incoming email is run in 2-3 RBL services to verify if the IP has been reported as spam before and blacklisted. If the IP is blacklisted then the email will be rejected
- The IP address of the incoming email is run in 2-3 RBL services to verify if the IP has been reported as spam before and blacklisted. If the IP is blacklisted then the email will be rejected
- Open DKIM
- If the incoming email header contains the DKIM Signature, Open DKIM will verify that the content of the email with the public key published in the DNS record and publish the verification result in the Authentication-Results header
- If the incoming email header contains the DKIM Signature, Open DKIM will verify that the content of the email with the public key published in the DNS record and publish the verification result in the Authentication-Results header
- Open DMARC
- Open DMARC will check the status of SPF and Open DKIM. Messages will be rejected if they fail the DMARC evaluation, or temp-failed if evaluation could not be completed. It will add the verification result in the Authentication-Results header
- Open DMARC will check the status of SPF and Open DKIM. Messages will be rejected if they fail the DMARC evaluation, or temp-failed if evaluation could not be completed. It will add the verification result in the Authentication-Results header
- Cmfilter
- Cmfilter essentially checks if the incoming is a spam, virus, or phishing email. If it is from spam IP or a virus email then it will be rejected. The way it works is given below:
- It compares the sender IP to the set of known spammy hosts and rejects if the email is received from a spammy host
- Cmfilter contains a cache of all signatures that have a known classification. It generates the signatures of an incoming message and compares them with known signatures and classifies them in different categories which are given below
- Spam: Spam email will get delivered to the spam folder and the subject will be tagged as SPAM
- Virus: Email with virus content will be rejected
- Phishing: Subject will be tagged as PHISHING
- Clam SMTP
- Clam SMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software. Emails with viruses are dropped silently and logged without any additional action taken.
- Clam SMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software. Emails with viruses are dropped silently and logged without any additional action taken.
- MIME Header Check
- MIME stands for Multimedia Internet Mail Extensions. This header check will essentially check the attachments that have been added in the email. If the file extension format isn't permitted by the incoming email server then the email will be rejected.
| alert-success | If all the above checks go through then the email will be delivered to your inbox. |
Hope this clarifies your doubts and you can entrust your inbox with us :)
If you have any further doubts, please feel free to reach out to us at support@flockmail.com