J-M-L:
That seems to confirm the hypothesis of lack of SRAM. Dig into your email library to see what’s being done. If large buffers are allocated then that’s probably the issueDo you have an arduino MEGA you could try the sketch on ?
I do not have a arduino MEGA... I am going to try to send email through PHP and keep the arduino just for storing data to database, this could solve my problem for now. In the future I will try again with MEGA to confirm the lack of SRAM.
Thank you for your help!