Hi Amie,
Have you considered using the built in API available with Microsoft Exchange? This should be more secure and utilise your local network/server encryption.
There's a great asset on the DX to get you started,
MS Exchange Functions - Agilify.
Let me know how you get on.
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Ben Lyons
Product Consultant
Blue Prism
UK
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Ben Lyons
Principal Product Specialist - Decipher
SS&C Blue Prism
UK based