[英]How to prevent HTML Email from having quoted printable when sending with C# using System.Net.Mail.MaiMessage
我正在尝试使用C#VS2012 .NET 4.5 System.Net.Mail.MailMessage将电子邮件发送到gmail地址。
电子邮件已发送,但始终包含:
Content-Transfer-Encoding: quoted-printable
当我在邮件客户端(gmail网络邮件客户端)中查看电子邮件的来源时。
我尝试了我能想到的与BodyEncoding,BodyTransferEnconding和DeliveryFormat等的每一种不同组合,但是没有什么可以摆脱此quoted-printable的。
问题是CSS在电子邮件中不起作用。 HTML呈现正常,但未应用CSS,当我查看电子邮件源时,我看到它在所有=符号后插入了此3D,这使CSS无法正常工作。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html dir=3D"ltr" xml:lang=3D"en" xmlns=3D"http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv=3D"Content-Type" content=3D"Type=3Dtext/html; charset=3Dut=f-8" />
<style type=3D"text/css">
...
我用来发送电子邮件的代码如下:
using (MailMessage _MailMessage = new MailMessage("[SENDER_EMAIL_REMOVED]", "[RECIPIENT_EMAIL_REMOVED]"))
{
SmtpClient _SmtpClient = new SmtpClient("smpt.gmail.com", 587);
_SmtpClient.EnableSsl = true;
_SmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
_SmtpClient.UseDefaultCredentials = false;
_SmtpClient.Credentials = new System.Net.NetworkCredential("[USERNAME_REMOVED]","[PASSWORD_REMOVED]");
_MailMessage.Subject = ""Test Email";
_MailMessage.BodyEncoding = System.Text.Encoding.UTF8;
_MailMessage.BodyTransferEncoding = System.Net.Mime.TransferEncoding.SevenBit;
_SmtpClient.DeliveryFormat = SmtpDeliveryFormat.SevenBit;
_MailMessage.Body = _MessageBody;
}
我发送的HTML是从已序列化到web.config的字符串中加载的,如下所示:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html dir="ltr" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="Type=text/html; charset=utf-8" />
<title>Page Title</title>
<style type="text/css">
.style1 {font-family: Arial, Helvetica, sans-serif; font-size: 12px; }
.style2 {font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-weight:bold; }
.tblRowHdrCol {font-family: Arial, Helvetica, sans-serif; font-size: 12px; font-weight:bold; background-color:#f0f0f0; width:180px; }
.tblRowValCol {font-family: Arial, Helvetica, sans-serif; font-size: 12px; padding-left:10px; width:100%; }
</style>
</head>
<body>
<p class="style1"><img src="http://www.domain.comn/image.jpg" alt="Some Image" /></p>
<p class="style1">
Some text here...
</p>
<table width="100%">
<tr>
<td class="tblRowHdrCol">Field One:</td>
<td class="tblRowValCol">[FIELD_ONE]</td>
</tr>
<tr>
<td class="tblRowHdrCol">Field Two:</td>
<td class="tblRowValCol">[FIELD_TWO]</td>
</tr>
<tr>
<td class="tblRowHdrCol">Field Three:</td>
<td class="tblRowValCol">[FIELD_THREE]</td>
</tr>
<tr>
<td class="tblRowHdrCol">Field Four:</td>
<td class="tblRowValCol">[FIELD_FOUR]</td>
</tr>
<tr>
<td class="tblRowHdrCol" colspan="2">Exception Details:</td>
</tr>
<tr>
<td class="tblRowValCol" colspan="2" style="padding-left:1px">[EXCEPTION_DETAILS]</td>
</tr>
</table>
</body>
</html>
因此,我将其装入并查找并替换[]占位符。
我该如何解决这个问题?
我什至尝试添加标头将其设置为7BIT:
_MailMessage.Headers.Add("Content-Transfer-Encoding", "7BIT");
它添加了此内容,但是当我查看gmail中的电子邮件来源时,它上面仍带有带引号的可打印内容。
问候,
史考特
据我了解,您无法使CSS正常工作。 我认为您必须转换html,以便将样式从style标签中取出并内联到html标签中。 有许多工具可以执行此操作,如果您想在C#中动态执行此操作,请看一下: 在C#中内联CSS
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