by post lunch.

[rajan]

Is the following sentence correct?

I will let you know by post lunch.

Thanks
Rajan

 

[5jj]

Not in BrE.

'Early afternoon' is more natural that 'post lunch'.

 

[Barque]

Rajan, like you, I'm Indian. Unfortunately over the last few years, it's become common practice in Indian English to use "post" as an exact synonym of "after".

It doesn't work.

I will let you know by post lunch.

I usually hear people say "I'll let you know post lunch" (without "by"). That doesn't work either.

Stick to "I'll let you know after lunch".