I don't think they are blocking any messages from SWREG or REGNOW. MTA is known as Message Transfer Agent. MHS (Internet Message Handling Services) uses Agents such as MTA which is a Process or a Software Agent implemented to Transfer mails between two Machines. Its a Single Hop Transaction. The Protocol used is SMTP.
MTS will receive mails from Mail Submission Agent (MSA), or a Mail User Agent (MUA).
If you use any software to receive mails such as mail clients they would use POP3 or IMAP Protocols. As an example "The Exchange Server".
Since you are using a Web Interface, such MUAs are not required.
Yahoo usually allows any source and the clients have to send mails properly in order to receive at the other side.
Its better to check your SPAM MAIL box.
There is no block or restriction. If you didn't receive their mail please contact them and let them know.
Feel free to contact if you are facing difficulties.
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