Query: Is there any limit on how many number of IMAP sensors that can be added?

[blag]

Digging through the code though, only one IMAP sensor will be created, but every time it polls it loops through all IMAP accounts, establishes a connection to the server for each account, grabs all unseen messages, and processes them by mangling some data and dispatching a trigger instance.

So, the full answer to your question is: only one sensor will ever be created, but there is no hard limit to the number of IMAP accounts that are monitored.

[transhapHigsn]

Thanks @blag