[PM-32450] Allow SMTP TLS CRL status retrieval failures

[dereknance]

🎟️ Tracking

PM-32450

📔 Objective

When connecting to an SMTP server with TLS, do not close the connection when the certificate revocation list is irretrievable either because the network is offline, or the status is otherwise unknown.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – 646e799c-49a6-4ec0-af6d-b7e6345a9073

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New Issues (2)

Checkmarx found the following issues in this Pull Request

#	Severity	Issue	Source File / Package	Checkmarx Insight
1		CVE-2026-32933	Nuget-AutoMapper-12.0.1	details Recommended version: 15.1.1 Description: AutoMapper is vulnerable to a Denial-of-Service (DoS) attack. Versions prior to 15.1.1 and 16.x prior to 16.1.1, when mapping deeply nested object ... Attack Vector: NETWORK Attack Complexity: LOW Vulnerable Package
2		SSL_Verification_Bypass	/src/Core/Platform/Mail/Delivery/MailKitSmtpMailDeliveryService.cs: 81	details /src/Core/Platform/Mail/Delivery/MailKitSmtpMailDeliveryService.cs relies HTTPS requests, in . The ServerCertificateValidationCallback parameter,... Attack Vector

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Fixed Issues (2)

Great job! The following issues were fixed in this Pull Request

Severity	Issue	Source File / Package
	Cxb9102459-6a3a	Nuget-AutoMapper-12.0.1
	SSL_Verification_Bypass	/src/Core/Platform/Mail/Delivery/MailKitSmtpMailDeliveryService.cs: 84

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 57.72%. Comparing base (5f1cdd5) to head (abfd1e0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rm/Mail/Delivery/MailKitSmtpMailDeliveryService.cs	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7271      +/-   ##
==========================================
- Coverage   61.84%   57.72%   -4.12%     
==========================================
  Files        2042     2042              
  Lines       89817    89830      +13     
  Branches     7985     7989       +4     
==========================================
- Hits        55548    51857    -3691     
- Misses      32329    36114    +3785     
+ Partials     1940     1859      -81     

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