It has links with the mail, maybe (5)

I believe the answer is:

chain

I'm a little stuck... Click here to teach me more about this clue!

'mail maybe' is the definition.
'chain' can be an answer for 'mail' (thesaurus). I'm not sure about the 'maybe' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for chain that I've seen before include "Mountain range" , "a number of hotels" , "lots of shops?" , "Coupling" , "series of hotels" .)

I've seen this clue in the Evening Standard.

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