unable to send mail containing pdf attachments from IMAP mail account using SMTP on iOS device mail app- same mail gets sent on other than iOS devices.
Sending email on SMTP from native iOS Mail client is failing with attachments.
Issue is occurring on iOS 14.4, 14.4.2.
The Mail sending does not fail with mails without attachments. The failure happens on all networks when there are pdf attachments in the mail.
The same mail with pdf attachments gets sent successfully from other than iOS device like a MacBook or Windows computer mail client (like native Apple Mail or Microsoft Outlook) using same IMAP account (which is failing in iOS) on all types of networks. No such error occurs when connecting through Gmail or outlook.com accounts. The error occurs only with IMAP type accounts and only on iOS device.
The Console on macOS shows the following line of error:
SMTP Delivery for messageID (null) failed with error MFError Domain=MFMessageErrorDomain Code=Generic(1030)
Sending email on SMTP from native iOS Mail client is failing with attachments.
Issue is occurring on iOS 14.4, 14.4.2.
The Mail sending does not fail with mails without attachments. The failure happens on all networks when there are pdf attachments in the mail.
The same mail with pdf attachments gets sent successfully from other than iOS device like a MacBook or Windows computer mail client (like native Apple Mail or Microsoft Outlook) using same IMAP account (which is failing in iOS) on all types of networks. No such error occurs when connecting through Gmail or outlook.com accounts. The error occurs only with IMAP type accounts and only on iOS device.
The Console on macOS shows the following line of error:
SMTP Delivery for messageID (null) failed with error MFError Domain=MFMessageErrorDomain Code=Generic(1030)