Re-sending emails kill HTML formatting

Hello,

I’ve been using Postman SMTP for about a year now with no issues which has been wonderful. However I came across a weird one today I was hoping someone could give some insight on and a potential fix. Last night, an email failed to send out which appeared to be a temporary issue with the SMTP server, as others went out following out just fine. In the email log, I clicked the “Resend” option so the intended recipients could get this message, which this time did not yield an error. While there was no error in the sending itself, the HTML was not processed like it usually is, so they received the message in raw HTML text rather than a processed HTML formatted email. Comparing the headers of the re-sent message and original sends with the proper formatting, I noticed an oddity. On the re-sent message, it looks like some JSON was not processed properly making a couple of the fields (in this case, reply-to, bcc, and content type) incomplete, as follows:

X-Mailer: Postman SMTP 1.7.2 for WordPress (https://ww.wp.xz.cn/plugins/postman-smtp/)
a: 4:{s:4:"From";s:45:"From: "xxxxx" <[email protected]>";s:8:"Reply-To";s:35:"Reply-To: [email protected]";s:3:"Bcc";s:27:"Bcc: [email protected]";s:12:"Content-type";s:38:"Content-type: text/html; charset=UTF-8";}
From ....

On a normal message, the headers do not have the additional code:

X-Mailer: Postman SMTP 1.7.2 for WordPress (https://ww.wp.xz.cn/plugins/postman-smtp/)
Content-Type: text/html; charset=UTF-8
From ....

I was wondering if someone could please look into this. Please let me know if there’s anything else you need from my end to assist. Thank you.