"reply via email" is correct and commonly used in written English.
It is typically used at the end of a request or statement to indicate that the preferred method of response is through email. Example: "Can you please send me the report by Friday and reply via email to confirm?".
The museum's curatorial team contacted Lego to place a bulk order and received Lego's reply via email on 12 September 2015: "We regret to inform you that it is against our corporate policy to indicate our approval of any unaffiliated activities outside the LEGO licensing program.
"We have no plans to," Steve allegedly responded in a one-sentence reply via email.
Recipients can also reply via email to write back, if they don't have the iPad app themselves.
Repeated efforts were made to contact these potential respondents who did not reply via email and telephone over a 1 year period.
If they informed you about your interview via email, it's usually acceptable to reply via email.
A spokeswoman replied via email, saying: "The police are now investigating some historic allegations of abuse at the school which have been the subject of recent newspaper reports.
The next day, Ms. Grillo replied, via email, noting a difference between her role as an intern assigned to "research and write a detailed story outline" for what became "Charles and Diana" and that of the authors of the final teleplay.
"I hope this show inspires an army of kids to grab their phones, notepads, and pens and go out into the world to find the truth and hold adults accountable," she replied via email.
When asked about their social media strategy, a spokesperson replied via email: "Before 2010 we used social media mainly as a marketing channel, and not as a corporate communications or customer service tool.
"Have you ever heard Tom Tancredo speak?" Atkinson kindly replied via email.
A spokesperson replied via email, "We cannot consider the company [to be] illicit...the contact person is not Mr Li Fang Wei.
