Reinstate disposition header for email messages

[fredden]

Description (*)

This pull request reverts the work-around introduced temporarily as part of #25076 and changes the minimum required version of upstream package laminas/lamnias-mail to fix the actual problem identified in #25076. External package has already been updated to fix the bug in 5498e76.

Related Pull Requests

Fixed Issues (if relevant)

• Fixes Magento 2.3.3 notifications converted to attachments in MS Exchange - Disposition Header #25076
• Fixes Magento does not send emails with Content-Disposition: inline headers anymore #29258
• Not strictly a pull request, but related commit that was added without a pull request: 6976aab / see Magento 2.3.3 notifications converted to attachments in MS Exchange - Disposition Header #25076 (comment)

Manual testing scenarios (*)

1. Generate an email from Magento (eg, new user welcome, sale order success)
2. Observe headers in email

Questions or comments

None

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[ihor-sviziev]

In general, looks good, but now the conflict appeared, also there still static test failures caused by different dependencies in the b2b and/or ee versions. Could you check that?

[ihor-sviziev]

@magento run Integration Tests, WebAPI Tests

[ihor-sviziev]

@andrewbess any thoughts on why static tests are failing?

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[ihor-sviziev]

@magento run all tests

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Hi @fredden, thank you for your contribution!
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[m2-assistant]

Hi @fredden. Thank you for your contribution
Here are some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

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<test-build(s)> is a comma-separated list of build names. Allowed build names are:

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10. Static Tests
11. Unit Tests
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13. Semantic Version Checker

You can find more information about the builds here

ℹ️ Run only required test builds during development. Run all test builds before sending your pull request for review.

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⚠️ According to the Magento Contribution requirements, all Pull Requests must go through the Community Contributions Triage process. Community Contributions Triage is a public meeting.

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📞 The triage of Pull Requests happens in the queue order. If you want to speed up the delivery of your contribution, join the Community Contributions Triage session to discuss the appropriate ticket.

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[ihor-sviziev]

@fredden
FYI the changes from this PR were already merged to 2.4-develop branch in 4a125b0 except the latest merge commit. As a result, the pull request wasn't marked as merged.
@sidolov will work on it to mark it as fully merged

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