Not receiving eCard email? OR Getting email in Spam?
As you know, email sending is a very sensitive process. It totally depends on the server (your hosting) from which it routes. It also varies in different email clients like Gmail, Yahoo and etc.
Sometime email is considered as a SPAM, Sometime it is late delivered etc issues come while sending email from normal server.
WP ieCard plugin simply use the WordPress (PHP) function to send the email. There are no settings for SPAM and etc. This is the main reason why email client services work like MailChimp, Sendgrid and etc for email purpose.
To overcome this situation, you can use SMTP plugin. SMTP plugin sends the email on behalf of you as a trusted user so it will not be considered as a SPAM and it helps to reduces the ratio of late email delivery and spamming. You can read more about the SMTP on web also.
Below are the WordPress Free plugins which you can use for SMTP
https://wordpress.org/plugins/easy-wp-smtp/
https://wordpress.org/plugins/wp-mail-smtp/
Kindly configure any one plugin with appropriate SMTP settings and then check. You can find the relevant document / setup link once you install the above plugin.
You can use your hosting email as a SMTP also. You can ask SMTP settings to your hosting company in case you want to use your hosting email as a SMTP.
Note : You need to configure it properly, otherwise no email will work.