[Bug]: Signature request e-mails going to Spam/Junk while notification e-mails are going through just fine

[BCHTester]

Issue Description

Something's going on with the e-mails sent from self hosted instances.
E-mails sent from the same e-mail address using SMTP.

Signature requests e-mails like:
"John Smith has requested you to sign Contract PDF" go to Spam/Junk.

But other e-mails like "Document Contract PDF has been signed by all parties" go to the Inbox just fine.
Tested with Gmail, Hotmail/Outlook and Yahoo. Same result.

I think it might be related to the e-mail format.
Can you please look into this?

Expected Behavior

Signature requests should not go to spam.

Current Behavior

Only signature requests go to spam.

Steps to reproduce

1. Create self hosted instance
2. Configure SMTP with your own domain
3. Make sure SPF, DKIM, DMARC is configured properly and your domain is not blacklisted
4. Test sending a Signature Request

Screenshots of the issue(optional)

Went to Spam/Junk

Went to Inbox

Operating System [e.g. MacOS Sonoma 14.1, Windows 11]

Debian 13

What browsers are you seeing the problem on?

Chrome

What version of OpenSign™ are you seeing this issue on? [e.g. 1.0.6]

2.38.0

What environment are you seeing the problem on?

Hosted (app.yourdomain.com)

Please check the boxes that apply to this issue report.

• I have searched the existing issues & discussions to make sure that this is not a duplicate.

Code of Conduct

• I agree to follow this project's Code of Conduct
• I have searched the existing issues & discussions to make sure that this is not a duplicate.

[PH03N1X999]

yes i can confirm this issue happens on my company mail also when sending sign request it will be blocked by microsofts quarantine service for the receiver. but if i send a link to them for signature and they sign it that signed mail will be received by both parties without any blocking like he said there is something in the format of the sending mail which blocks/ sent to junk please fix this issue