Emailsender: issues in email. Noticed when sending email to SMS

[Kalvin]

First off …THANK YOU for the effort you put into this and other projects. Lots of work. Your effort does not go unnoticed. Thank you.

Renzo, I may have stumbled on an issue with your emailsender. I’m still trying to locate the exact cause of it but here are the details.

With gmail removing the “less-secure apps” I needed to fix some code on my ESP8266 projects to continue to send email to a telephone number that then sends a text (SMS) to my phone.

I’m using a gmail account to send the email. From the ESP8266 I can send an email using your example code to an email address and every thing works fine. When I try to send this exact test message to the SMS provider I only see the subject line in the text message with no body.

I tried another SMS provider for my friends phone and the email message will not even get converted over to a SMS message and he receives nothing.

I found that adding a \r\n to the end of the “Subject” will show the body of the message in the text, however you will also see some of the “external body” in the email body.
From what I understand the boundary of the external body is controlled with the \r\n (maybe used twice) as a marker.

i.e. This is the body I see with added \r\n in the subject line.

MIME-Version: 1.0
Content-Type: Multipart/mixed; boundary=frontier
–frontier
Content-Type: text/plain; charset=”UTF-8″
Content-Transfer-Encoding: 7bit

This is the BODY

Normally you would not see the Mime info….only the “This is the BODY”

Without the \R\N in the subject you will not see any of the body and only the subject on my SMS server.

Most email clients seem to be able to handle the problem and display the message correctly. So far I only found the two SMS email to text services that are having problems.

Something similar was mentioned about mailsend here..
https://github.com/muquit/mailsend/issues/108

This might give you some ideas..
https://stackoverflow.com/questions/6783863/what-is-the-proper-newline-in-emails-lf-or-crlf

Also could “folding” and “unfolding” be causing this. Just some terms I came across well trying to find an answer.

Something in the code is causing some of the mail clients to have an issue. Gmail seems to handle incoming messages without an issue.

I’m thinking it may be a missing \R or\N in the code causing the issue. I’m still looking.

I did try another ESP email piece of code I found online and it seems to work without this issue.

This might help others who are having issues. If you need any more details, I will check in here and try my best to help solve the issue.

Again Thank you. 🙂

[Renzo Mischianti]

Hi Kalvin,
sorry if I answer only now, but I return to my home this day.

Do you try to send the message with mime type TEXT?

I fight with /n/r on another topic, and I fix a lot of bugs with outlook and others, now It works correctly with the majority of the clients.

Can you tell me which SMS provider you use? so I can do some tests.

Bye Renzo

[Kalvin]

Hi Renzo,

No rush. 🙂

Yes, I used the mime text …. message.mime = MIME_TEXT_PLAIN;

I was not sure if the order of the message.subject, message.message and message.mime made a difference, so I tried all the different positions (order). ( I had read somewhere that the mine needs to follow the subject.) No joy.

My SMS email to text address is 4031234567@pcs.rogers.com, only the subject will come thru.

My friends SMS email to text is 4031234567@txt.freedommobile.ca He did not receive any message at all.

We are located in Calgary, Alberta, Canada.

best regards,

[Author]

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