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Got. Travel system sends airlines tickets via SMIME.P7 files. My android phone email is telling me I don't have the right app to open the file. I have PDF reader, Adobe Acrobat and another but nothing seems to be opening the file.
Opening and reading PDF files in Microsoft Edge on macOS
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Hi, Todd. I'm glad to assist you today and I'm sorry to know you're getting this issue.
SMIME is a standard protocol for sending signed and encrypted emails. In order to be able to open it, your phone will required a certificate.
If you have any issue opening the content, please contact your airline support staff.
Please let me know if you need anything else.