-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 mCqwfcwDmixLB5vy+yTK4A==

<SEC-DOCUMENT>0001209191-04-021457.txt : 20040421
<SEC-HEADER>0001209191-04-021457.hdr.sgml : 20040421
<ACCEPTANCE-DATETIME>20040421145927
ACCESSION NUMBER:		0001209191-04-021457
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040419
FILED AS OF DATE:		20040421

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			S1 CORP /DE/
		CENTRAL INDEX KEY:			0001063254
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING, DATA PROCESSING, ETC. [7370]
		IRS NUMBER:				582395199
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		3390 PEACHTREE ROAD NE
		STREET 2:		SUITE 1700
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30326
		BUSINESS PHONE:		4048126200

	MAIL ADDRESS:	
		STREET 1:		3390 PEACHTREE ROAD NE
		STREET 2:		SUITE 1700
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30326

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SECURITY FIRST TECHNOLOGIES CORP
		DATE OF NAME CHANGE:	19980603

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MAHAN JAMES S III
		CENTRAL INDEX KEY:			0001036743

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24931
		FILM NUMBER:		04745283

	BUSINESS ADDRESS:	
		STREET 1:		3390 PEACHTREE RD NE
		STREET 2:		STE 1700
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30324
		BUSINESS PHONE:		4048126710

	MAIL ADDRESS:	
		STREET 1:		3390 PEACHTREE RD NE
		STREET 2:		STE 1700
		CITY:			ATLANTA
		STATE:			GA
		ZIP:			30324
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-04-19</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001063254</issuerCik>
        <issuerName>S1 CORP /DE/</issuerName>
        <issuerTradingSymbol>SONE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001036743</rptOwnerCik>
            <rptOwnerName>MAHAN JAMES S III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O S1 CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>3500 LENOX ROAD</rptOwnerStreet2>
            <rptOwnerCity>ATLANTA</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30326</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>8.0700</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-04-19</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>100000.0000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-04-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>100000.0000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>100000.0000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The option vests in four equal annual installments beginning on April 19, 2005.</footnote>
        <footnote id="F2">Not applicable.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Richard P. Dobb (by power of attorney)</signatureName>
        <signatureDate>2004-04-19</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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