Merhaba geçmiste bir forumda yazmis oldugum (2014 yili) Embarcadero Delphi XE8 kullanarak Cross Platform (Windows, IOS, Android) da kullanmak üzere cihazlardan çek gönder uygulamasi örnegi paylasmistim. Umarim isinizi görür.

function Tcekgonder.SendEmail(sendTo: string;
subject: string;
body: string;
attachFiles: TStringList;
smtpHost: string;
smtpPort: Integer;
smtpUser: string;
smtpPass: string;
tls: TIdUseTLS): boolean;
var
smtp: TIdSmtp;
ssl: TIdSSLIOHandlerSocketOpenSSL;
msg: TIdMessage;
i: Integer;
begin
smtp:=TIdSmtp.Create(nil);
ssl:=TIdSSLIOHandlerSocketOpenSSL.Create(nil);
msg:=TIdMessage.Create(nil);

msg.ContentType:= 'text/html; charset=UTF-8';
try

try
smtp.Host:=smtpHost;
smtp.Port:=smtpPort;
smtp.Username:=smtpUser;
smtp.Password:=smtpPass;

//smtp.OnConnected :=IdSMTP1Connected;
//smtp.OnDisconnected :=IdSMTP1Disconnected;
//smtp.OnFailedRecipient :=IdSMTP1FailedRecipient;
//smtp.OnStatus :=IdSMTP1Status;
//smtp.OnTLSNotAvailable :=IdSMTP1TLSNotAvailable;
//smtp.OnWork :=IdSMTP1Work;

if not (tls=utNoTLSSupport) then begin
ssl.Destination:=smtpHost + ':' + IntToStr(smtpPort);
ssl.Host:=smtpHost;
ssl.Port:=smtpPort;
ssl.SSLOptions.Method:=sslvTLSv1;

//ssl.OnStatusInfo:=IdSSLIOHandlerSocketOpenSSL1StatusInfo;
//ssl.OnGetPassword:=IdSSLIOHandlerSocketOpenSSL1GetPassword;
//ssl.OnStatus:=IdSSLIOHandlerSocketOpenSSL1Status;

smtp.IOHandler:=ssl;
smtp.UseTLS:=tls;
end;

msg.Recipients.EMailAddresses := sendTo;
msg.Subject:=subject;
msg.Body.Text:=body;

if(Assigned(attachFiles)) then begin
for i := 0 to attachFiles.Count - 1 do begin
if FileExists(attachFiles) then
TIdAttachmentFile.Create(msg.MessageParts, attachFiles);
end;
end;

smtp.Connect;
smtp.Send(msg);
smtp.Disconnect;
showmessage('Mailiniz gönderilmistir');
result:=true;
finally
msg.Free;
ssl.Free;
smtp.Free;
end;
except
result:=false;
end;

end;

--------------------------------------------------------------------------
procedure Tcekgonder.Button1Click(Sender: TObject);

var

attachmentFiles: TStringList;

begin


//KodDogrula (TCkimlik.Text);
attachmentFiles:=TStringList.Create;
try

attachmentFiles.Add(System.IOUtils.TPath.GetDocumentsPath+'/cekgonder.jpg');

try

SendEmail( 'tuncay.ozer@gmail.com.',
''+tckimlik.Text+' - Çek Gönder Istegi',
''+TCKimlik.Text+'</br>'+telefon.Text+'</br>'+ mesaj.text +'',
attachmentFiles,
'smtp.gmail.com',
587,
'istekyapanlar@gmail.com',
'*********sifre ********', utUseExplicitTLS);
except
on E : Exception do
begin
ShowMessage('EXCEPTION: message=' + E.Message);
end;
end;
finally
attachmentFiles.Free;
FileExists (System.IOUtils.TPath.GetDocumentsPath+'/cekgonder.jpg');
end;
end;

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procedure Tcekgonder.TakePhotoFromCameraAction1DidFinishTaking(Image: TBitmap);
var
ScaleFactor: Single;
begin
if image.Width > 1024 then
begin
ScaleFactor := image.Width / 1024;
image.Resize(Round(Image.Width / ScaleFactor), Round(Image.Height / ScaleFactor));

end;

self.resim.Bitmap.Assign(Image);
self.resim.Bitmap.SaveToFile(System.IOUtils.TPath.GetDocumentsPath+'/cekgonder.jpg');

end;