I have a user that cannot open his inbox in the web. After some digging, I'm getting API Service errors, and an infinite spinner when clicking this user's inbox:
[2020.04.27] 20:28:40.939 Buffer cannot be null.
[2020.04.27] Parameter name: buffer
[2020.04.27] at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled) 20:28:40.955
[2020.04.27] Buffer cannot be null.
[2020.04.27] Parameter name: buffer at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled)
[2020.04.27] 20:30:03.088 Buffer cannot be null.
[2020.04.27] Parameter name: buffer
[2020.04.27] at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled) 20:30:03.135
[2020.04.27] Buffer cannot be null.
[2020.04.27] Parameter name: buffer at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled)
[2020.04.27] 20:46:04.017 Buffer cannot be null.
[2020.04.27] Parameter name: buffer
[2020.04.27] at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled) 20:46:04.049
[2020.04.27] Buffer cannot be null.
[2020.04.27] Parameter name: buffer at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled)
[2020.04.27] 20:47:44.593 Buffer cannot be null.
[2020.04.27] Parameter name: buffer
[2020.04.27] at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled) 20:47:44.609
[2020.04.27] Buffer cannot be null.
[2020.04.27] Parameter name: buffer at System.IO.MemoryStream..ctor(Byte[] buffer, Boolean writable)
[2020.04.27] at MailService.Mailboxes.TempMailMessage.GetParts()
[2020.04.27] at MailService.Mailboxes.MailMessageBase.get_MainPart()
[2020.04.27] at MailService.WCF.Messages.GetMessageListing(String emailAddress, String ownerUsername, String folderName, Int32 startIndex, Int32 count, MessageSortType sortBy, Boolean sortAscending, Dictionary`2& timings, IResult functionResult, List`1 selectedIds, List`1& removedIds, Boolean uidOnly, Dictionary`2 searchFlags)
[2020.04.27] at MailService.WCF.EmailWCF.MailService.GetMessages(String token, MessageSearchInput input, Boolean ApiTimingEnabled)