Phone Not Sending Emails

A few weeks ago I discovered that emails sent from my iPhone 14 were not in fact sending. There was no prompt indicating a failure or inability to send; I simply found out over time as I realized people were not receiving my communications. Said emails would not appear in sent, outgoing, or drafts folders either. Eventually, a restart resolved the issue, however it has now resurfaced. It is not due to a lack of internet/wifi access. What can I do to prevent this from re-occurring? It has already caused me significant work issues wherein co-workers have not received critical responses that I had otherwise assumed were delivered. Checking my outbox to confirm whether or not an email has been effectively delivered each time I press send is also not practical. Thank you in advance.