java mail outlook,Java Mail附件未显示在Outlook中

ゞ浴缸里的玫瑰 2023-01-24 04:22 130阅读 0赞

![Image 1][]

we use Java Mail to send E-Mails with PDF attachments via SMTP over Lotus Notes to our customers.

Some time ago we got notified that serveral customers don't received an attachment.

One of these customers uses Microsoft Outlook and got an attachment flag in his inbox. But when he opens the

E-Mail, he doesn't see an attachment. We don't have the possibility to check the version of the E-Mail client's

and to do customer side test's, because our customers are worldwide located.

If our customer responds or (internal) forward the E-Mail, the attachment shown in receiver's E-Mail client.

The following part is the affected Java source code:

private static Multipart createMultipartMailWithAttachment(String messageText)

throws MessagingException \{

// Message with attachments

Multipart mp = new MimeMultipart();

// Attach Text

MimeBodyPart mbp1 = new MimeBodyPart();

mbp1.setText(messageText, UTF8, HTML);

mp.addBodyPart(mbp1);

for (File f : attachments) \{

MimeBodyPart fileAttachment = new MimeBodyPart();

try \{

fileAttachment.setDisposition(MimeBodyPart.ATTACHMENT);

fileAttachment.attachFile(f);

if(f.getName().toLowerCase().endsWith(PDF\_EXTENSION)) \{

fileAttachment.setHeader(CONTENT\_TYPE, APPLICATION\_PDF);

\} catch (IOException e) \{

returnMessage = e.getMessage();

mp.addBodyPart(fileAttachment);

return mp;

We already tested different webmail services like gmail.com, yahoo.com and outlook.com. In every case the

attachment was shown. Also in an local installation of Mozilla Thunderbird, Microsoft Outlook or Lotus Notes

was the attachment shown.

After many inquiries we got many different solution processes. See setDisposition(MimeBodyPart.ATTACHMENT) and

setHeader(CONTENT\_TYPE, APPLICATION\_PDF). None of these solutions lead us to success. Does anyone know

a solution or a new solution process to solve that problem?

解决方案

We had a similar problem where we sent file attachments from a J2EE application to various mail accounts. We utilized SMTP gmail server (smtp.gmail.com) with port 465 and HTTPS connection type for our outgoing messages.

Attachments to the messages sent via Java were not shown in Outlook but we could observe them in web interface for gmail accounts.

In our case, it turned out to be that MimeMultipart construction was not the correct one. We had

Multipart multipart = new MimeMultipart("alternative");

When we modified it to

Multipart multipart = new MimeMultipart();

the attachments became visible.

Please also refer to the following resource for a full explanation.

[Image 1]:

java mail outlook,Java Mail附件未显示在Outlook中

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