我想发送一封带有嵌入式图片的邮件(不作为附件文件)。我已经成功发送了邮件。
我使用以下代码发送邮件:
internal static void Send(SmtpServerConfigurations configurations, EmailMessage emailMsg)
{
using (var mail = InitializeMailMessage(emailMsg))
using (var smtpClient = CreateSmtpClient(configurations))
smtpClient.Send(mail);
}
private static MailMessage InitializeMailMessage(EmailMessage emailMsg)
{
var mail = new MailMessage
{
From = new MailAddress(emailMsg.From),
Subject = emailMsg.Subject,
IsBodyHtml = emailMsg.IsBodyHtml
};
mail.To.Add(emailMsg.To);
AddMessageBody(emailMsg, mail);
return mail;
}
private static void AddMessageBody(EmailMessage emailMsg, MailMessage mail)
{
if (emailMsg.IsBodyHtml)
{
var body = GetHtmlBody(emailMsg.Body, emailMsg.EmbeddedImages);
mail.AlternateViews.Add(body);
}
else
mail.Body = emailMsg.Body;
}
private static AlternateView GetHtmlBody(string body, List<EmbeddedImage> embeddedImages)
{
var alternateView = AlternateView.CreateAlternateViewFromString(body, null,
MediaTypeNames.Text.Html);
if (embeddedImages == null) return alternateView;
foreach (var image in embeddedImages)
{
var imageToInline = new LinkedResource(image.Path, MediaTypeNames.Image.Jpeg);
imageToInline.ContentId = image.Id;
alternateView.LinkedResources.Add(imageToInline);
}
return alternateView;
}
private static SmtpClient CreateSmtpClient(SmtpServerConfigurations config)
{
var smtpClient = new SmtpClient(config.Host);
smtpClient.Port = config.PortNo;
if (config.IsAuthenticationRequired)
smtpClient.Credentials =
new NetworkCredential(config.Username, config.Password);
else
smtpClient.UseDefaultCredentials = true;
smtpClient.EnableSsl = false;
return smtpClient;
}
但是使用上述代码发送的邮件并不符合我的要求。
我想要的是:
MIME-Version: 1.0
From: x@y.com
To: a@b.com
Date: 11 Nov 2016 11:37:52 +0530
Subject: This is subject
Content-Type: multipart/related;
boundary=--boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d; type="text/html"
----boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN" "=
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xm=
lns =3D "http://www.w3.org/1999/xhtml" > <head ><meta http - equi=
v =3D "content-type" content =3D "text/html; charset=3DUTF-8" /><=
/head ><body style =3D"font-family: Segoe UI; text-align:left;" >=
This is body<br /><img alt =3D"" src =3D"cid:05393c56-15c1-4652-a=
31f-9cc513726bc0" height=3D"50" width=3D"50"/></body ></html >
----boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d
Content-Type: image/jpeg name="filename.jpg" <<-----This is what I want.
Content-Transfer-Encoding: base64
Content-ID: <05393c56-15c1-4652-a31f-9cc513726bc0>
/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAIBAQIBAQICAgICAgICAwUDAwMDAwYEBAMF
BwYHBwcGBwcI
.
.
.
/w20K7sPt8ul2st3/z0dd36Hj9K9I+HHwj8M6/rLaldaJp8l6y
kGRYgn6LgfpXve0pundwQmk9z//Z
----boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d--
我了解的是:
MIME-Version: 1.0
From: x@y.com
To: a@b.com
Date: 11 Nov 2016 11:37:52 +0530
Subject: This is subject
Content-Type: multipart/related;
boundary=--boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d; type="text/html"
----boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN" "=
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xm=
lns =3D "http://www.w3.org/1999/xhtml" > <head ><meta http - equi=
v =3D "content-type" content =3D "text/html; charset=3DUTF-8" /><=
/head ><body style =3D"font-family: Segoe UI; text-align:left;" >=
This is body<br /><img alt =3D"" src =3D"cid:05393c56-15c1-4652-a=
31f-9cc513726bc0" height=3D"50" width=3D"50"/></body ></html >
----boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d
Content-Type: image/jpeg
Content-Transfer-Encoding: base64
Content-ID: <05393c56-15c1-4652-a31f-9cc513726bc0>
/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDAAIBAQIBAQICAgICAgICAwUDAwMDAwYEBAMF
BwYHBwcGBwcI
.
.
.
/w20K7sPt8ul2st3/z0dd36Hj9K9I+HHwj8M6/rLaldaJp8l6y
kGRYgn6LgfpXve0pundwQmk9z//Z
----boundary_3_1bb3db0a-d33f-46a7-a6ce-60249096160d--
如何在嵌入式图像区域的原始邮件中实现自定义“名称”标题?
我想添加该标题的原因是:
当我在Gmail收件箱中单击图像上显示的下载按钮时,我会得到一个没有扩展名的“无名称”文件。除非用户将其扩展名更改为“.jpg / .jpeg”,否则该下载文件没有用途。
![Download image button on gmail](https://istack.dev59.com/n90ND.webp)
请建议如何做到这一点或任何其他实现方式。