Email Send Sometimes and sometimes Not

Question

I am using my domain account address omer@planrbme.com.pk to send email to gmailYahoo and other domain account addresses  It send correctly with gmailyahoo mail but with some specific domain like d.habib@plan-international.org it send emails randomly sometimes it send and some times it did not send  I have method on the button click whcih call another method and at the end this method call the email send method. below is my method which works fine for gmail and yahoo accounts but did not work for the specific domain account like d.habib@plan-international.org why is it so i am checking that from past two days but i could not find a solution yet . Thanks in advance

Amar Gaikwad · Answer

Are you getting any exception while sending an email to the mentioned account? Have you checked Junk / Spam emails of mentioned account? If email delivery fails then the account from which you are sending an email will get an email containing the details about email delivery failure (like recipient's mailbox is full). Few organizations block the emails if there are any suspicious words present in email. Considering this possibility please try to send an email with only 2 words. The account from which you are sending an email might be blocked by the account holder to whom you are sending an email. If you are sending an email through SMTP on which you have some control then you can find such non-delivered emails in SMTP with exception details. Please check all the above mentioned points. You will surely find few pointers for resolving email issue.