Skip to content

fix: filter Content-Transfer-Encoding from custom headers #158

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
drish merged 1 commit into from
Feb 27, 2026
Merged

fix: filter Content-Transfer-Encoding from custom headers #158

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion lib/resend/mailer.rb
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,7 @@ class Mailer
cc bcc
from reply-to to subject mime-version
html text
content-type tags scheduled_at
content-type content-transfer-encoding tags scheduled_at
headers options
].freeze

Expand Down
9 changes: 9 additions & 0 deletions spec/railtie/mailer_spec.rb
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -207,4 +207,13 @@ class TestMailerWithDisplayName < TestMailer
body = @mailer.build_resend_params(message)
expect(body[:headers].keys).to eq(["custom-header2"])
end

it "filters content-transfer-encoding from custom headers" do
expect(Resend::Mailer::IGNORED_HEADERS).to include("content-transfer-encoding")

message = TestMailer.html_text_msg("test@example.org", "Test!")
body = @mailer.build_resend_params(message)
headers = body[:headers] || {}
expect(headers).not_to have_key("Content-Transfer-Encoding")
end
end