Daily vs Every day

shaunI have been sending him reminder emails daily from 25th June.

Correct. I would use "since" instead of "from".

In American English it's June 25th, not 25th June. Different formats apply in different countries.

shaunAlso can I replace daily with 'every day' ?

Yes, you can.

CJ

Because you did not specify a second time period, from is inappropriate here; instead, use since. Also, I would rewrite the date.

I have been sending him reminder e-mails daily since the 25th of June.

Yes, daily and every day are interchangeable in your sentence.

CalifJim I would use "since" instead of "from".In American English it's June 25th, not 25th June. Different formats apply in different countries.

I, a speaker of British English, would also use 'since'.
'25th June' or '25 June' are both fine in British English. - In both cases we normally say, "The twenty-fifth of June"; we do not write the i

"The twenty-fifth of June"; we do not write the italicised words.

That is something new for me (the italicized) Thanks a lot!

Thanks a lot CJ!

@aspara gus

Thank you too!