O365 IMAP Authentication: OAuth and MFA Solution

IMAP / O365 / OAUTH / OAuth2

There is much confusion and worry about Microsoft’s plans to disable standard password authentication for the IMAP, and POP3  protocols. Here is the announcement posted on 20-Sept-2019 on the Office 365 blog: https://developer.microsoft.com/en-us/office/blogs/end-of-support-for-basic-authentication-access-to-exchange-online-apis-for-office-365-customers/ Chilkat already supports OAuth2 for the IMAP, POP3, and SMTP protocols. (Microsoft will continue to support basic …

Email Attachment Info when Downloading from IMAP without Attachments

attachments / IMAP

If the Imap.AutoDownloadAttachments property is set to false, or if headers-only are downloaded, then emails will be downloaded without attachments.  However, attachment information, such as the count, and the size and filename of each attachment is still available. When an email is downloaded from an IMAP server without the attachment …

IMAP: Download email without attachments and downloading attachments separately.

IMAP

Chilkat version 9.3.0, being released this week, includes new IMAP functionality to fetch emails without downloading attachments, and then subsequently fetch attachments one at a time separately. There is a new boolean property named “AutoDownloadAttachments”, which has  a default value of True (YES).  If set to False (NO), then all …

IMAP: Sequence numbers change when deleting (but not UID’s)

IMAP

Question: When using IMAP and fetching emails by sequence, does looping through the sequence get affected by deleting in mid-sequence or other changes to the mailbox’s content on the server? Answer: The answer is obtained by examining the IMAP specification (RFC 3501).  Here’s what it says: 2.3.1.2. Message Sequence Number …

VB6 Error — “TYPE MISMATCH (ERROR CODE 13)” w/ IMAP Search method

error messages / IMAP / vb6

This happens if the Chilkat ActiveX objects are dragged and dropped onto your formvia the “Project–>Components” menu. Instead, add a reference to the objects via the “Project–>References” menu. Instances of the object should be created dynamically. For example: Dim imap as ChilkatImap Set imap = New ChilkatImap

IMAP Authentication using OAUTH

IMAP / OAUTH

Using the Chilkat IMAP component/library, it is possible to authenticate using OAUTH via the SendRawCommand method. Instead of calling the imap.Login method, you would instead call imap.SendRawCommand as shown here: string response = imap.SendRawCommand(“AUTHENTICATE XOAUTH <base64_data>”); Your application will need to compute the OAUTH base64 string. Chilkat does not implement …